Mac Pro drive confiuration

I'm about to buy a new MacPro box, the base Mac Pro 2.8 Quad.
I have a 26" NEC monitor, hoping to add the 30" NEC to that. Also have an e-SATA 5 bay Burley external enclosure.
Will be running PS CS5,  Lightroom, C1, some Premiere/FCP plus the usual business related software that doesn't push the hardware too much. I'm concentrating on the photography aspect here, not the video.
I'm a pro photographer, but running a business, so trying to build to what I need, while keeping a hard eye on budget.
Shoot 99.9% RAW files, DSLR 21MP + hi res film scan and medium format (45MP) RAW. Current LR catalog has 25,000 image files.
I'm now down to deciding on the drive configuration. Would love to hear any comments or suggestion on how to simplify or make this more efficient etc.
Put in after market RAM to bring up to 24MB as 3x8MB chips, so I can later add another 8MB chip to make it 32MB total (4x8MB).
Stick with the base video card in the base 2010 MacPro.
BOOT (System + Apps) - OWC SSD drive 240GB - also set as scratch drive AND have Lightroom Previews and Catalog.
QUESTION - enough room for scratch and for LR Previews and Catalogs?
4 internal drive HD bays set up as:
MASTER 2x2TB HD's set-up as RAID-0 stripe - all working files
TIME MACHINE 2x2TB HD's set-up as RAID-1 Mirror - back up of MASTER and
QUESTION - can I manually have Time Machine back up my LR Previews and Catalog from the SSD Boot drive they are on?
External Burley 5 bay.
Set-up as "ARCHIVE". Images files that are not in current active use. As soon as a job is finished and delivered, files are moved from MASTER to ARCHIVE.
ARCHIVE 1 - 2 TB HD
ARCHIVE 1 (Backup) - 2 TB HD
Bays 3-5 remain empty and fill with drives as Archive increases.
Any comments, suggestions, improvements, flaws in my reasoning?
Thanks!

I wondered if you'd be able to pop it into the optical slot, but didn't know.  Will the adapter slow it down?
Yep, the consensus is that right now, SSD's should not be used where a lot of small writes/reads/writes are being done.  Fragmentation turns out to be a really really big problem.
Hmm... here's a non-technical article that shows why: http://www.bit-tech.net/hardware/apple/2010/07/01/mac-ssd-performance-trim-in-osx/1
End result, using it for something like a preview cache or scratch disk is contraindicated.
What you're doing for backups makes reasonable sense, as long as you realize that you will lose the entire backup with one failure, and will have to take immediate action to recover from another source and restore that one segment of your backup.  The biggest fault I have with Raid1 (mirroring) is that you can actually lose both disks if you aren't watching carefully.  Raid1 will read from whichever drive is responding fast enough/has the correct data.  So if you have (for simple example) two drives and 5 things on them...  the first drive might go back in section 1, the second drive might go bad in section 3... and unless you make sure to notice, you could cascade the failure and lose both of them at once.
  I haven't seen it happen, but have seen it come close.  Lost both drives a week apart.  I had just enough time to get a new drive in for the first one (didn't have one on site as I figured I had time, right?) and get it installed and copied, when I lost the second one.  Fun. Switched to Raid5 and have a spare disk onsite.
But with 2 levels of local and offsite backups, the most likely scenario is you will probably lose only a day's work (depending on what goes bad when you notice).
Oh, and keep in mind: DVD/CD backups are only good for between 5 and 10 years...  Then you need to rewrite/copy to make SURE it keeps integrity.
Cheers!

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