You're not going to use the extra hz for gaming in game mode. That only adds an extra delay.
For gaming you need a tv with fast response time and pixel to pixel mode.
On the cheap end lcd is usually better then plasma. lcd screens don't flicker so hz is irrelevant, unless you want smooth motion for watching movies. I personally hate that, 24fps for me as it was filmed at, but some people like having it upscaled to 120fps.
(Still waiting on a tv that can fix screen tearing by running at a variable frame rate)







