I did a bit of research last year before I got me new telly.
You'll only notice the difference between plasma and LCD above about 42 inches, except in the price as plasma tend to be more pricey.
I settled for a Sony Bravia 40 inch LCD and never looked back, even with standard Sky the picture is brilliant, I use the Wii and the PS3 with it and can't complain a jot. Works great in direct sunlight too, as long as the screen is clean!