In almost any thread, the HD5770 gets recommended and for very good reason. I wonder how hard nVidia is crying over this...
well, my suggestions are always base on money... I won't suggest a (not so great) card with a high price.
What are you planning to run in 1080p? Games, MKV's, porn? Lol.. Are you planning to go CrossfireX or SLI? If you're doing just video playback @ 1080p then any 5770. If you are planning to game @ 1080p then 2 Galaxy GTS 250 in SLI or 2 Sapphire 5770's in CrossfireX would be just what the doctor ordered!
neither....5850 ! just read it here on tomshardware