I will be playing on 3 TVs.
My main TV for movies is a new LG 47" LCD which is magnificent for films, but has input lag way too high for MK. I measured it (using Rockband Audio and Video Lag Calibration tool on my 360) at 90ms. This is 50 ms more than I would have dreamed of playing Quake 3 online on my pc, although that is network lag.
The other TVs are a 32 inch Goodmans LCD, which is quite old, but has zero input lag.
But the TV I will play this on the most is my LG 23" TV that I have a PS3 & PC on a computer desk, so I am very close to it. It has wonderful picture and very little/no input lag compared to the larger set.
All are connected via HDMI and are 1080p sets.
TVs now are getting worse for input lag - even quite pricey TVs, so beware.
Anyone thinking of buying a TV that will be used a lot for gaming should check out the AV Forums for real advice.