Well at work we use plasma and LCD. So what gives the best picture? Simple, the 15 year old Sony 27″ CRT cube monitors. Not much call for 4×3 these days though and they weigh about the same as a small car.
I went LCD because I didn’t want reflective glass. Best image I’ve seen for a while though was a 37″ Sony Plasma, looked a lot like a CRT monitor with realistic skin tones. I’m not sure who actually make them for Sony though as they don’t produce plasma screens themselves.
If you go with LED you may need to but a speaker system immediately as the very thin units have no room for speakers that don’t sound pretty poor.