Well for gaming at 1080p most would recommend the GTX 460 and the HD5770 if you can't afford that. The HD5750 is a notch below that. It will still do alright but you'll usually have to leave AA off and you'll need to turn down settings on a lot of the more intensive current games.
If you don't really care about DX11 then you can also consider the HD4850 or GTS 250 as they are very close in performance to the HD5750 and usually notably cheaper.
gaming at 1080p is irrelevant due to the fact that I use linux and ati doesn't give a flying crap about us.
I can do only with ati because I can split the feeds to the right connectors using the foss driver.
with nvidia closed driver I cannot split the feeds and as easy and the foss is worse then the ati driver.