It depends on how you enjoy your TVs. A lot of TV sets are now not just HD, it is becoming more and more internet enabled (smartTV). LED type is the most favorable due to power consumption but brand wise, I got no preference.
3D programming is way far out there, only for movies right now. What I have is Samsung. But if you're not in the hurry to buy, I suggest to wait. The top of the line today will be half the price in more than a year.