1000 is entirely too much to spend on something that is literally obsolete when you walk out the door, wtf is wrong with people?!
go to frys and get a motherboard cpu combo, if they dont have one you like, just WAIT for it to come out. This way you wont spend $200 and you got a pretty good chunk of it out the way. dont slack on ram, a nice 1gb stick will let you play games JUST FINE, 2gb is possible overkill (only the super nerds will tell you otherwise), go out and find you a nice looking no name 30 dollar case, might come with a power supply... take it out and replace it with a nice 50-75 dollar power supply, if you go with a 7600, look for the company off pricewatch that is throwing in a nice ass power supply for only 15$ more... (i just ordered this the other day and can link you)...
(i'm rounding WAY up, you also need a operating system)
so thats 200 max on cpu mobo combo
160 for video card with a power supply
75 for a 1gb stick of ram
30 for a case
50 for a hard drive
50 for a dvd burner/cd burner
20 bucks for a freakin 20 inch crt/flat panel monitor, used (from the monitor man, i picked up my 21" triniton from this guy, dude is AWESOME!)c
and right there you got yourself a computer that will plan ANY game on the market, with EASE... for the hard core obsessive, another gb of ram would be fine, but by no means necessary