For my AV 5.2 (separate from my 2 channel system) I'm using a set of Bowers and Wilkens towers (683 S2s) center channel HTM6, surrounds (607s) and 2 subwoofers (ASW8s).
I think having the matched set of towers and center channel gives the same tonal quality to voice, music and action sounds. The rears mostly play only ambient sounds in the 5.2 set up and I haven't noticed much difference if I switch them out with a non B&W option.
BTW the 607s are good enough to use in a bookshelf or bedroom set up as stand alone 2 channel set up. So probably not taxing their capability much with 5.2 use.
AV amp is a Marantz 5.2 Model 1510