Got an old and noisy HD3870 vid card and was thinking of getting something from the 5xxx line to replace it but am not sure which to choose. I'm not a gamer, but I do have my current vid card hooked up to my 32" LCD TV and I play HD content on it. Got my 22" PC monitor on the other connection and I'm interested in something that will give me a nice bump in performance and also hopefully something quieter. Any ideas what I should be looking for? Thanks.