Best Mac Pro Setup for Photoshop CS5

I've read around that it's not needed to have the fastest (and costliest)  Mac Pro to run Photoshop CS5 at it's best. 
However, there doesn't seem to exist any discussions involving the latest models (Feb 2012).
Which would be the optimal Mac Pro available today for running large files (1GB and up) in Photoshop CS5?

LOTs of RAM, fast 6-core 3.33GHz for starters.
Mac Pro Photoshop CS5 and Lightroom 3
Optimize Photoshop CS5
Optimize CS5 CS4 Mac OS X
http://www.macperformanceguide.com

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    From: TLL... <[email protected]>
    Subject: Best PC to buy for Photoshop CS5, Premiere Elements and Proshow Producer
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