Hi, I am looking to buy centre speaker and surrounds very soon for my system. Currently have Mission 734i floor-standers as the main pair (can't really have a sub as I live in a flat!, but guess the missions can handle plenty of bass) Problem I have is that the rears are very limited as to possible placement. Basically they are gonna have to go on the rear wall, facing directly out into the room (which is 4metre square) and they're also gonna be high up (almost ceiling height). The sofa is also on the back wall. I was thinking of bi-pole Missions (77ds), I know ideally they should go on the side walls, but this aint possible due to a door being in the way! Haven't bought the amp yet, but am looking at either Denon 1802 or Marantz 5200. Anybody got any suggestions please???