its funny you mentioned you changed your mind on the two graphics card to go to the single 8800GT cause that is exactly what i was goin to reccomend.
Also you seem to have some how included the idea of 4gb of ram and thats exqactly what I would be doing.
I have Crysis sitting here (unopened) along with UT2007, I am not installing crysis until I get the 8800GT as I don't want to get the poops with my current temporary PCI-e card (7300GS).
I had two XXX edition 8600GTS cards and they were rubbish compared to a single 8800GT/GTS/GTX/Ultra.
Now I have a very similar PC E6850 and 4gb DDR2800... I had 2gb but realised vista is a hungry little pig, and even at times I find myself wishing for another 4 
I had a 430W PS (thermaltake) that I ditched and fit a 750W in its place. System is much happier now.
GET THE 550W as the bare minimum.
Cheers
Grimace
I rule!!!
2.4" of Pure FURY!!!
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