Gigabyte GTX 460 1GB Super Overclock ftw imho, very quite cooling and able to OC, if needed all the way to 930/1860/1100 (4400), fans rarely go higher than the default 40% (near silent). I ran mine at 880/1760/1050 (4200) and got almost 60fps running BC2 online (1920x1080, 32xCSAA, 16xAF, HBAO disabled)
the price has held on these monsters for the last year or so, if you dont have a 460 already I think the 560 is well worth looking at, maybe costs 10/20 USD more, and you can pick up a 560ti for 50/60 USD more than the cost of 460
food for thought
chaz
edit: ive checked the newegg website, 75 USD between the best rated GTX 460 (EVGA) and the best rated GTX 560 ti (also EVGA). the best rated GTX 560 sit inbetween those 2 GPU but much closer to the 460 price (btw the best rated 560 are EVGA, ASUS and MSi), ratings as per newegg customers