there are 3 diff projection TV types:
1. CRT: traditional big screen tv, usually poor viewing anglesbut gennerally the cheapest type
2. LCD rear projection: big screen,good side to side viewing, uses little LCD chips to filter light to make a picture(simple explanation) generally poor black level (black doesn't look black, more grayish), more expensive
3. DLP rear projection: big screen, better black level than LCDs, uses a rotating color wheel to filter light to display picture, but some people can see a "rainbow effect" (color wheel doesn't spin fast enough for some people with fast eyes so there is an interesting color effect as scene changes, never seen it myself)costs on par with LCD
Plasma: usually very expensive compared to others and along with CRT subject to burn in (images such as video game menus or even sports tickers that stay on screen for long periods of time leave a kind of ghost on the screen
Im just a noob on this stuff but if u want to learn more about it go here
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if console or pc gaming is a must go LCD or DLP
otherwise go to the store and buy what looks best and fits the budget