What's the best setup / use for Thunderbolt + SSD iMac ?

Hi!
I'm testing one of the new 27" iMacs (i7, 16gb ram, SSD, 2tb internal HD, external Promise Thunderbolt disk)
I have until Monday to decide to keep it or return it and I'm doing this test to see if it would make a good second computer for our editing (primary is 8 core MacPro).
I can either afford this 27" iMac with a Promise Thunderbolt disk OR anoher MacPro with 4 internal disks.
Can someone please share with me how I would get max performance out of the iMac-setup?
Here's what I THINK prior to adding the Thunderbolt disk:
Internal SSD => Lion + apps
Internal HD => imported videofiles, scratchdisk, cache etc. and export disk
But then......... how should the situation change when adding the Thunderbolt drive ?
Is the Thunderbolt so fast, that all video data should be placed there or would I benefit from placing SOME part on the internal HD, and OTHER parts on the external Thunderbolt ?
Or even more complex ........ should I use all three disks (also the SSD) for different parts of the video / process and if so, what's your thoughts?
Or......... would you go for yet another 8 core Macpro without SSD and Thunderbolt??
Thank you for the inputs on this

klp29 wrote:
Or even more complex ........ should I use all three disks (also the SSD) for different parts of the video / process and if so, what's your thoughts?
Or......... would you go for yet another 8 core Macpro without SSD and Thunderbolt??
Are you only using one Thunderbolt disk?  If so, IMHO, you're wasting the beauty of TBolt.  To make much better use of it will cost a pretty penny, but you end up with a 4, 6, or 8-disk external RAID enclosure.  In that, you stuff a bunch of drives and create however many RAID volumes you want.  Preferably a couple of separate RAID0 volumes for the speed (raw data on one of them, scratch space on another, backing the raw data up elsewhere).
However, one TBolt disk is really a waste.
Were I buying a Mac right now, I'd get the following:
6-core 3.3GHz Mac Pro
aftermarket SSD (to hell with Apple's pricing)
aftermarket RAM (see above paranthetic)
2 10k WD SATA drives for an internal software-only RAID0 array for scratch
aftermarket ESATA PCIe card
ESATA enclosures with drives
That last bullet is "up to you" bit.  You can do 2 external enclosures with RAID0, RAID1, whatever works for storage and speed.  And it can be built piece-meal as you need to expand.
Why did I pick the 6-core vs. one of the 2 x 4-core machines?  Horsepower, pure and simple.  Those 3.3GHz 6-core chips are quick little bastards (compared to the rest of the Mac Pro line) and you really want raw number crunching power vs. a bzillion cores.  Put the apps and OS on the SSD.  Scratch space on the internal 10K drives.  Then figure out how to split the storage up with your external enclosures.
When you're ready, grab a Quadro 4K card and enhance your video editing speed substantially.
jas

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    A Windows malware attachment in email is usually easy to recognize. The file name will often be targeted at people who aren't very bright; for example:
    ♥♥♥♥♥♥♥♥♥♥♥♥♥♥!!!!!!!H0TBABEZ4U!!!!!!!.AVI♥♥♥♥♥♥♥♥♥♥♥♥♥♥.exe
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