I've read some negative reviews about the new 62-series Sharps (42", 46", 52") on CNET:
http://reviews.cnet.com/Sharp_LC_46D62U/4505-6482_7-32069030.html?tag=txt. If you see one in person and you don't observe these issues, please post back as I would consider the 52" set for myself if I could have any assurance of quality. Also, be aware that the 45-series (e.g. LC45GD7U) might have issues receiving a 1080p signal over HDMI, and will not accept one over VGA.
I'm very ticked off at Sony at the moment after their rootkit escapade
and their insistence on pushing blu-ray instead of reaching consensus with the HD-DVD camp :x , but I also would have a hard time recommending anyone else's LCD HDTV - or DLP, for that matter. Their LCD TVs really do have decent scalers for SDTV (though your GPU's might still be better), and do receive and show true 1080p. As for their DLP TVs, I can only go by my observations in stores that theirs appear to have better viewing angle performance than most other DLPs I looked at. I still wouldn't get a DLP, but for your size and price range it might be the best option depending on the seating arrangement in your room / space. I looked at these both in a Sony Style shop (not a good place to buy, but a good place to look at any rate!), and in a Best Buy Magnolia and Circuit City, comparing to other vendors / models.
Samsung also makes a line of 1080p LCD units which might be close to your size / budget req's. I haven't seen any of these in person yet, though, so can't comment.
Quick warning: I know you're not interested in plasma, but just an additional disincentive in that I was looking at the new Pioneer 1080p model (FHD1, I think?) in a Best Buy - Magnolia, and noticed significant issues with the image quality of a scaled image. There were horizontal distortion-lines in the image, running roughly every 60 pixels or so. These weren't always noticeable, but when they were it was quite distracting. It was as if every nth line was from a couple of frames earlier, so the colors and edges didn't quite match up. I showed the sales guy and he agreed with me that it was bad - especially at the marked price (over $7K !!!).