I'd go with the 8600GTS personally, it'll be quite powerful, not as powerful in games like Crysis as a DX9 card would be though because of all the eye-candy.
Hey, Thanks for the input dude!
Thats the thing with the PSU, I've read that it only draws like 260watts on a whole system (with GPU, CPU, RAM, everything, so I'm thinking mine would be fine. Also, It needs 26A on the 12V rail, I don't know how to work it out but, I have 2 12v rails with 17A on each
EDIT: Did a PSU calculator and it says I need a 348Watt PSU, Filled it all in correct too
http://www.extreme.outervision.com/PSUEngine
MSI 8600GTS 256MB Overclocked version gets my vote again
Dont ask me why...you already know what im going to say
DX10!
I just did that test and i need a 639 PSU aparantly> ive only got 530 and am comforatble