You mention not wanting to bottleneck your pc, you might want to get something with 2g+ of ram. It depends on what you play, and at what resolution, but having 1.5+ gb of vram is possibly valuable. The lower level nvidia cards won't have that. If the leaked stuff about the new nvidia cards is correct, you might wait until april/may. If it isn't or you don't care to wait, you still might consider waiting another week or so (someone said the 20th something of february?) when the amd 7800 series releases. It will basically be a newer version of the current 6900 series, with lower power usage and a better architecture (correct me if I'm wrong anyone). Even if you didn't like the 7800 series, it'll probably drive down the prices on the other amd offerings, and possibly the analog nvidia cards.
People say "yeah but you can wait forever" or "new stuff is always just over the ridge" which is true...but, in this case it's like 7 days for the new amd stuff, and you might find something out now has gotten cheaper, or something new that's better.
On a side note if you really wanted a 560 448, if you go to the anandtech forums there's a deal for a galaxy for like 220 with free shipping that ends today (I know this isn't the deal forum - but it seemed relevant...mods please don't ban me :x)
Edited by pfunkmort - 2/14/12 at 11:50am