I have a 46" 8000 series Sasmung LED TV.
It's great, I love it. Default settings are a bit gash, but once you set it up it's a fantastic picture. Even plays SD pretty well. Loads of inputs, plenty of pointless gadgets built in (like the ability to have the TV send a signal to the remote control which then emiits a sound so you can find it, play youtube directly on it).
I have been a "wait-and-see" type for a couple of years until I decided to just say sod it and actually buy something, as there is ALWAYS a new technology just around the corner with TV's.
OLED's are comming out soon, they should be fantastic, but they're gonna be mega expensive for a while yet and not very big. Sony have an 11 inch OLED set out. It's a snip at 3 and a bit grand. LG are bringing one out next year in Korea with a massive 15" screen.
Also, if you're gonna stick with Sky HD, you probably don't really care about DVB-T2.
saying all that, the only real special thing about the LED TV's is that they are much thinner than others. this is because of the way they are backlit. Conventional screens are lit with a cold cathode from behind, while the LED's are side lit with LED's (hence the name) the panel itself is pretty much the same.
To make matters worse, they reckon that 3D-HD will be out in 3 to 4 years, and you'll need a whole new type of TV for that :S