Need guidance - replace entire iTunes Match library with new library

Been using iTunes as my music manager/player since 2003. Currently have about 5,000 songs which are a mix of selective CD song rips, iTunes purchases and Amazon Mp3 downloads. Lots of missing artwork, incomplete albums, wrong genres, etc. I use iTunes Match to sync across multiple Macs and iOS devices, including 3 Apple TVs. It all works OK, but I recently undertook a major project to re-rip all of my CDs/Box Sets in their entirety – about 20,000 tracks. I performed the new rips on a Mac Mini running Windows 7 in BootCamp using Roxio Creator to get a 'universal' Mp3 (256kbs) format and keep everything separate and apart from my current iTunes/Match libraries. Total library size came out around 80-85GB, saved on an external USB HDD.
Recently had my iMac 1TB HDD replaced under Apple’s recall program and looked at it as an opportunity to totally rebuild my iTunes library from scratch using the new, complete album rips. I’ve loaded the new 80GB library onto the iMac and am currently using TuneUp Media to ‘clean up’ metadata and album artwork on the new library. I've turned off iTunes Match to isolate the iMac during this stage of the process.
When cleanup is complete, I would like to totally replace my current iTunes Match library with the new larger library. I think the songs will sync OK, but I’ve put a lot if effort into cleaning up the album artwork and am afraid that, if I don't take some precautions, iTunes Match will overrule and mess up my new artwork when I activate it.
My plan is to
From the iMac, first copy (or should I export) the entire rebuilt library to an external drive as a backup, hopefully preserving all of the artwork and metadata corrections in the process (true?).
On my MacBook Pro, copy my current Match library to a different external drive to ensure preservation of any unique tracks I may have missed in building the new library. Then delete the entire library – both local and Cloud. I should then have an empty iTunes Match library, correct?
Then, on my iMac, activate iTunes Match and let it upload/match all the new songs/data to create a new Cloud library with all the new albums, descriptors and artwork.
Do I need to individually deactivate Match and delete local libraries on all my other devices also, or does the total Cloud library delete I perform on my MacBook Pro then transfer to all my other registered iOS and OSX devices that have Match activated?

Thanks bmw249. I have good news and bad news. Good news: Apple very quickly deauthorized my computers so I was able to drop the lost computer that was taking up a slot and (I suspected) confusing iTunes Match.
The bad news is that this didn't make any difference. Nearly all the songs in my iTunes library have an iCloud status of "error" and when I turn on iTunes Match, it churns for a while before telling me that I already have 25,000 songs in the cloud and can't add any more. What I expected is for it to recognize that most of the 25K songs are the very same ones sitting in this local iTunes library. It should be substantially fewer than 25K because I also deleted 1000+ classical music pieces that I have sitting in Amazon Cloud, in hopes of freeing up space for my recently purchased and created music to be uploaded to iCloud. But no dice.
I am now downloading ~800 songs that iTunes thinks I have only on iCloud. I then plan to figure out how to deactivate iCloud and iTunes Match on this PC so that nothing will be deleted locally when I cancel my iCloud account (it runs out in March 2013 but I assume I can cancel and deactivate the account sooner). The "convenience" of this service isn't worth the many dozens of hours of hours I have spent trying to get it to work the way Apple says it works. Amazon Cloud (also costing ~$25 a year) has a limit of something like 20 GB and no specific limit on number of songs. I buy most music there anyway and have already uploaded most of the rest, so this makes the most sense. I really like the way iTunes Match can (in theory) keep all my music sync'd and smoothly stream to my iPhone even over 3G. Amazon Cloud takes a bit more effort but does much the same thing.
Thanks for listening. I'm assuming this is a "moderated" forum and that this post will soon be removed for my Amazon comments. 

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    Been using iTunes as my music manager/player since 2003. Currently have about 5,000 songs which are a mix of selective CD song rips, iTunes purchases and Amazon Mp3 downloads. Lots of missing artwork, incomplete albums, wrong genres, etc. I use iTunes Match to sync across multiple Macs and iOS devices, including 3 Apple TVs. It all works OK, but I recently undertook a major project to re-rip all of my CDs/Box Sets in their entirety – about 20,000 tracks. I performed the new rips on a Mac Mini running Windows 7 in BootCamp using Roxio Creator to get a 'universal' Mp3 (256kbs) format and keep everything separate and apart from my current iTunes/Match libraries. Total library size came out around 80-85GB, saved on an external USB HDD.
    Recently had my iMac 1TB HDD replaced under Apple’s recall program and looked at it as an opportunity to totally rebuild my iTunes library from scratch using the new, complete album rips. I’ve loaded the new 80GB library onto the iMac and am currently using TuneUp Media to ‘clean up’ metadata and album artwork on the new library. I've turned off iTunes Match to isolate the iMac during this stage of the process.
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    My plan is to
    From the iMac, first copy (or should I export) the entire rebuilt library to an external drive as a backup, hopefully preserving all of the artwork and metadata corrections in the process (true?).
    On my MacBook Pro, copy my current Match library to a different external drive to ensure preservation of any unique tracks I may have missed in building the new library. Then delete the entire library – both local and Cloud. I should then have an empty iTunes Match library, correct?
    Then, on my iMac, activate iTunes Match and let it upload/match all the new songs/data to create a new Cloud library with all the new albums, descriptors and artwork.
    Do I need to individually deactivate Match and delete local libraries on all my other devices also, or does the total Cloud library delete I perform on my MacBook Pro then transfer to all my other registered iOS and OSX devices that have Match activated?

    Quick question, Michael
    When I copy the iTunes  folder to an external drive, does all the iTunes metadata and associated album artwork travel together with the raw music file?

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    Thanks bmw249. I have good news and bad news. Good news: Apple very quickly deauthorized my computers so I was able to drop the lost computer that was taking up a slot and (I suspected) confusing iTunes Match.
    The bad news is that this didn't make any difference. Nearly all the songs in my iTunes library have an iCloud status of "error" and when I turn on iTunes Match, it churns for a while before telling me that I already have 25,000 songs in the cloud and can't add any more. What I expected is for it to recognize that most of the 25K songs are the very same ones sitting in this local iTunes library. It should be substantially fewer than 25K because I also deleted 1000+ classical music pieces that I have sitting in Amazon Cloud, in hopes of freeing up space for my recently purchased and created music to be uploaded to iCloud. But no dice.
    I am now downloading ~800 songs that iTunes thinks I have only on iCloud. I then plan to figure out how to deactivate iCloud and iTunes Match on this PC so that nothing will be deleted locally when I cancel my iCloud account (it runs out in March 2013 but I assume I can cancel and deactivate the account sooner). The "convenience" of this service isn't worth the many dozens of hours of hours I have spent trying to get it to work the way Apple says it works. Amazon Cloud (also costing ~$25 a year) has a limit of something like 20 GB and no specific limit on number of songs. I buy most music there anyway and have already uploaded most of the rest, so this makes the most sense. I really like the way iTunes Match can (in theory) keep all my music sync'd and smoothly stream to my iPhone even over 3G. Amazon Cloud takes a bit more effort but does much the same thing.
    Thanks for listening. I'm assuming this is a "moderated" forum and that this post will soon be removed for my Amazon comments. 

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