Depends on what size you want. but for the price i'd get the TC-P50X2 is a good tv.
Its the 2011 model of the price-efficient 720p model that sold really well last year too. it is base-model tv (meaning no features that make it look or perform above average).
I would ask what gaming will you be doing without high definition. xbox, ps3, and even the wii are capable of some form of high def (1080p-except for wii). if you're playing older consoles then the tv quality is almost irrelevent-you're looking at pixels anyway. i wouldn't spend a bunch of money on a tv with a high resolution, or with the 120hz or 240hz image processors, cause sd gaming wouldnt have an advantage on it.
So: TC-P50X2 - this is a 50" if u want smaller maybe get the 42" of this tv, but the plasmas are only 40+ i believe