Having recently shopped for TV's, I can mention a few things:
For gaming, I'd say avoid plasma as the risk of burn-in is heightened when playing video games due to pausing the game(although plasmas have built in features to counter this to an extent these days). Plasmas also have a shorter shelf life which you may experience in a few years time if you are a heavy TV user. They are however better about refresh because they operate differently than an LCD/LED. Also, a previously mentioned, 60Hz will not be enough. Minimum 120Hz for gaming. Next, I think LED is still more hype than anything else. When comparing LED vs LCD, the difference in contrast, color, and black depth exists(LED being a slight step up), but the difference is small unless you go very high end and certainly not worth the extra coin if you are on a budget. The biggest thing with the LED's is that they are very thin...LCD's are a couple inches thick, LED's are ~.5".
All that said, I settled on a Samsung LCD with a glass screen and have been extremely happy.