I would, personally, stay away from any SLI/Crossfire solution, and just get a single, powerful video card (GF GTX 275 or something in that region).
I would also get Nvidia over ATI, because of better driver support, but ATI also makes good cards.
Also, RAM is cheap enough to just get 2x2GB dual channel (for the first), or even more.
Why is the 2nd HDD on the second one so small?
Other than that, both look good. With no price given, it's difficult to say more.
Ah, yes, make sure you get an upgrade option for Windows 7 (
AFAIK that's possible currently, to get Vista with upgrade option to Windows 7, once it is available).
Bye
Thanee
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