Theatre Match for B&W 801 Series 2

I am building a new theatre room. I have B&W 801 Series 2 for the fronts and Matrix HTM for the center. I am trying to figure out what to purchase to match the timbre for wall mounted rear and sides in a 7.1 system. Someone suggested D3S. Any help would be greatly appreciated.
Matrix 805 or more HTM (which is basically a shielded 805).

FWIW, IMHO, 7.1 was generally not much better than 5.1 (due to sources, not speakers).