I'm going to be looking to buy in a couple weeks.
I mainly want to play MW2 and Black Ops when it comes out, plus i'll be using for normal college work.
I currently have a Rosewill 500W psu and i'm running an 8600gt, which can actually get 80 fps in mw2 at 1440x900 if you tweak the game enough.
I have a p35 board with a 7200gt, which I'll be over clocking after i get a new gpu, going for 3 ghz.
I'm not looking to sli or crossfire, and will most likely not overclocking the GPU.
My monitor is 1080p and i understand i'll prolly have to turn down the pretty stuff to make it run smoothly.
I've been thinking a 5770, gt 240, or maybe an older 9800gt.
for $100 you can't get a 5770. However for $104.99 after rebate you can get THIS
excellent 5750 or for $79.99 after rebate you could get THIS
Note that both cards are factory OC'ed and should run cooler and faster. You will need the 5670 1GB version since your working with 1920x1080 resolutions. It will have... adequate? performance in most games, However I would recommend the 5750 or 5770 over it.
Both card's should work fine with your PSU. however if you supply your power ratings I should be able to confirm it.