I have a plasma w/ component cables at home. It's a Panasonic Viera, the one everyone raves about as having "no lag".
Idk if I have it set to the correct settings, but the TV still has significant, unplayable lag.
I have an awesome CRT setup right now, consisting of two perfect condition, large CRT's, both of which I found on the side of the road.
I have a 32" Sanyo hooked up to my Wii and recording setup, and a 27" Symphonic Flat Panel hooked up to my Gamecube.
They both work immaculately and without lag.
If I can somehow find a way to play on my HDTV without lag, I'd be open to it, but for right now, the CRT's are my favorite thing ever. I have kinda taken to collecting them as a hobby. I have found 4 in my neighborhood, and just today spotted a 30-someodd inch TV at a local hand-me-down store for dirt cheap, in great condition. I also saw a 12-inch monitor today for 3 dollars. I may go back for them tomorrow.