I had a similar setup in my old houses living room, I mounted a center channel speaker on its own cantilever tv mount so it could be pulled out and pointed the same way as the tv...
KEF and Boston acoustic make some sound bars, I have a Kef in the bedroom with 2 hts5001.2, and a cheap sub, I paid $600 for the bar and 2 wall hangers, they sound really good for movies, but not good at all for music...
For a sub I just bought an HSU, it sounds awesome, and they are not much money...