mostly for gaming? LCD hands down.
I bought a plasma recently, but it's mainly to watch sports and movies... and its on during the day sometimes, so daytime performance was important too. occasional xbox 360 use, but not enough to warrant going lcd and its inferior sports watching or daytime glare issues.
lcd still doesnt compare to plasma when it comes to watching sports though... getting better though. just pick up any review mag and you'll soon see what im talking about.
Edals said:
"Stay away from Plasma. They are very cheap, but they are loud, and use about 350WATTS of power for the size you are after. A good LED LCD uses about 100-150 or less."
He's only right on the power consumption, as plasma does use more. Depends entirely on brand you buy regarding quality (like anything else). My 50" Panasonic Plasma (the 800A, Full HD) is neither cheap nor noisy, and outperforms most if not all LCD's out there- at least it did 12 months ago!
but the title of your thread says it all.... gaming = lcd.
size wise, it completely depends on the room you'll be putting it in- and the distance you'll be sitting at. having a big bertha tv in a bedroom will only get you upset at its apparent poor quality. great website with calculator explaining optimum viewing distance and angles vs screen size referring to THX standards can be found here:
Viewing Distance Calculator