My room size is 18x20 x18 (ceiling). On the front is the 52 LCD TV, to the left are windows to the back yard , the right are open to stairs and front door and to the back are open to kitchen. I will have to wall mount the surround speakers on the back (floor stands will not be an option). They will have to be ~7 ft high.

Which will sound best direct reflect (Ascend 170 or 340) or dipole (Axiom QS series or Rockets)? For movies?