LED LCD, and please, for the love of all things good, make sure its backlit and not just edgelit. Unless you have a space problem, edgelit is just not as good as backlit.
I know that (last time I checked) Samsung and Sony, had both gone to Edgelit, while Sharp has remained Backlit - but do your research and remember, it doesn't matter how good it looks in the store, when its at home, it stands alone, so make sure its good, but the best? Well, maybe not necessary. And I'd advise against 3D, its a gimic, and people will regret it in 5 years (I hope).
Oh, and I still have a CRT

- But its not 1080p, so, I may have to jump up soon.
EDIT: Yes, response time is vital, especially for video games and sport watching (ha, like any of us do sport watching, sorry, but its worth mentioning atleast). Old LCDs ust to suffer ghosting, so check into the Hz I think 100-200Hz is ok, but don't just go with that, 2ms is what I think is good enough for a PC monitor, but a larger screen the rules change.