It would help to know the speaker models and the size of your space for sub sizing.
I have the Energy Audissey A3+2 front speakers, a Pioneer Elite T2MC09 center channel and had an M&K V125 sub that i think just died. (just humms)
My living room is approx 25' X 35' and opens into the kitchen area that is prob about the same size as the living room. I have cathedral ceilings that go from the front, over my living room, peaks at the break bt living room and kitchen, and down to the other side of the kitchen. (not sure if you can visualize) It's a pretty large open space from my living room into the kitchen.
The TV is going to be mounted just to the left of the highest point of the ceiling. I have the rear speakers mounted in the wall behind my couch.
I can probably spend around $1000 for the receiver. I have the Sony 3D DVD player and want to get the most out of my movie experience. I also have DirecTV.
What do you suggest?