Cyrk,
If you want a BIG screen, I would recommend a DLP; they have no screen aging or burn-in effects and give you overall the best picture for the money. Progressive scan (e.g. 720p) is better than interlaced (e.g. 1080i) at displaying movement. I have a Samsung which was the first TV manufacturer to use the technology (developed by TI). The picture is awesome. Nobody has been able to detect any of the "so-called" rainbow effect. The user-replaceable bulbs last about 8,000 hrs. Although I haven't used it for gaming, this reviewer has: review
You might also consider the new JVC's These (which are a kind of hybrid between LCD and DLP) have no rainbow effect, and use a cheaper bulb.