What to do for the rear?

Thiel Power points, mounted above the seating possition (is next to impossible to go wrong with ($2600 a pair though!?) or Aerial Accoustics rears ($2800/pr) mounted on the ceiling above your head!...

Semwin1, In wall speakers have a problem with interaction of the wall. It generally get worse the higher the volume. Going anyway from this design usually improves the sound. As far as direct, dipole, bipole, etc..., I would suggest you A/B between them and see which you like better. I think that depends on your tastes. The above suggestions are great speakers, but I would suggest you match your front speakers (most make a voice matched rear). I swore I would never go away from 2 channel stereo, but after listening to multi-channel stereo, I trashed my cheaper rears and bought the match for the fronts(I use Hales Design). It sounds great, not that I still don't listen in 2 channel mode at different times. Happy listening.....LR