When I bought my current house, there was a cheap home theater installed with in-wall speakers for five channels. I decided to take the in-wall speakers that were installed in the front and mount them in the ceiling slightly behind the seating positions. The rear in-walls were mounted on the back wall behind us.
Then I used my Revel F50/C50 speakers for the front L/R/C. I am using a Marantz av8802 processor and Sunfire Theater Grand 7-channel amp to drive them.
I've had much fancier surround speaker systems in previous home theaters, but this combination seems to work quite well - provide good ambiance and surround effects, while not taking any extra space in the modest size room.
The Revels work well in a theater environment. They have nice tonal quality and just enough detail to make dialog highly intelligible, but not so much as to make poor soundtrack recordings unlistenable.
I use this system for tv and movies only. I am fortunate to have a separate 2-channel music listening room.
