We're finishing up some construction and, while I've got guys around who channel wires and patch drywall a lot faster than I can, I want to take the opportunity to upgrade my system from 5.1 to 7.1 or 7.2.

But my current surrounds are old QS2s. I'm reasonably happy with them. I would like to avoid something really large hanging on the side or back walls of the room.

I'm wondering about either keeping the existing QS2s for rear channels, and using something like the M2 or M0 in-wall units for the side surrounds. I would actually prefer to use the quadripoles for side surrounds but I can't put in-wall speakers in the back wall; it's plaster on wire lath on brick.

The other option I guess would be to try to find something small and inconspicuous from another manufacturer that's a good match for the QS2s and just pick up a pair of those.

Fronts are M3ti, center channel is a VP100, sub is a Hsu. I'm reasonably happy with the system now but this seems like the right time for an upgrade.

Suggestions?