grafix card choice

i have around 200 bucks for a card. i want to buy from new egg, tiger direct, or some other trust worthy site. nvidea preferably, ive been looking at 9600's 8800's and such, i just cant figure it all out. i want the most bang for my buck, i know what im doing when it comes to pcs, i mounted my own, right now im running duo core with 3ghz processors, 2 gb or ddr2, and my pci can handle anything, so its not an issue, i got space inside so im sure it will fit. i just need some help guys, tell me what ur using, maybe ill save up for a nicer one if its that nice

http://www.newegg.com/Product/Product.aspx?Item=N82E16814125225i

if u can save up some more miney get the 4870 i have above for 220$ after MIR.