Hi all.
I recently got myself a nice new HD TV, and I'm looking to get myself sound to match the picture

The problem is my house has quite thin walls, and rather than feel guilty everytime I watch a movie for fear of keeping my neighbours up, I thought a decent headphone solution might be a good alternative.
My requirements are basically 5.1 sound (high def sound if that's available), and preferably wireless (although not a deal breaker).
I imagine purchasing an amp would be a good idea, but if so, I'd prefer to get something which I had the option of using speakers with as well.
Hopefully that's not too vague!! Any suggestions?