as for the DX10 issue, look out there in internetland, because Razor1911 released a DX9 WinXP crack for the game so you can run it without Vista and DX10.
A game DOES NOT, I say again, DOES NOT, require more power than any other, your software has nothing to do with (not directly anyway) your PSU, or power output. (Most people don't need the extreme power PSU's out there anyway. 700w and upwards is almost completely unnecessary - unless you have two 8800 Ultra in SLi and 8 HDD's. - you get my point)
As for the DX10 requirement, it requires DX10 installed, NOT a DX10 card! I'm running it with a 7800GT (which has DX9.0c-based hardware) and it's running perfectly fine. (On Vista, with DX10 installed.)
And yes, as mentioned, there is a crack which also enables you to run the game in a DX9 environment. (Not sure how they do it, there are several possible methods for this though).
Just to make everything even more clear
AMD FX-62 2.8ghz
GForce 8500 GT
4gb ram 667
Seagate 500gb 10,000rpm 16mb-cache
Ultra-X 700watt SLI-ready
Vista-32bit Business(cannot turn down free software)
Maybe I will get into SLI, who knows, at least my hardware is ready..
Also, why not get a GOOD video card? the 8800GTS isn't expensive, and can easily be overclocked to be close to the GTX. Also, AMD is no longer the cool hip thing. Intel has better processors for lower prices.
You should have one or two smallish fast drives for the OS (I have 2x 74 gig 10k RPM raptors in a RAID-0) and games and a few big drives with your music, movies, tv shows, cd images, whatever spread out on them.
* Updated game trainers and cheats daily
* Get notified when new cheats are added
* Request which games get new trainers
* Priority support with any problem