First, remember that HDTVS will give you Pixel Pitch and various issues even via HDMI out. HDTVs are not intended for PC gaming.
The things you should be most concerned about when purchasing a gaming display is:
Connection: VGA = NONO. DVI = OK, HDM = Better.
Your GPU of course.
As for Display properties:
Vertical Refresh Rate:
True Contrast Ratio (Black-White not Grey-White)
Vertical Viewing Angle:
Dynamic Contrast Ratio
As a final note, I find that my best ever Gaming LCD was a BENQ, rarely mentioned. Look into them. Unfortunately it was damaged during a move
I've read up on a good amount of guides for viewing distances when it comes to HDTVs, and from what it seems like I could get a 52" in my room if I really wanted to. I've measured that my viewing distance will be around 78 inches, and from the guide on this site, a 52" would require a viewing distance between 78 and 104 inches. So I would be right at the minimum. But I've also begun thinking about how during gaming, I'm going to have to see and be able to at a lot of things on the screen, and a screen that is too big will just cause a lot of eye strain. So I've decided that settling for a 46" would most likely be the best decision. But I just want some good opinions on this issue, especially if you're a gamer. I don't think this would be too much of an issue if my room wasn't so small though :\