Speaker suggestions for saround sound.

FWIW, I am using Monitor Audio system Apex 40 x 3 in front and Apex 10 (Apex more similar to MA Silver line than Gold) for rears in a surround system and this is working quite well for either 2.1 or 5.1.  The B&W PV1-D sub is a critical component and a remarkable device, capable of handling both analog and digital inputs and digging deep. See system here for details https://systems.audiogon.com/systems/6241/edit

monitor audio has been a favorites since the MD952 an R700 days. Monitor audio tends to be designed around the idea of "space" being portrayed.
Probably a good thing for home theater. Depends on the rest of the gear.
The high slope crossovers for the B&W, though, tend to make angle of incidence for the seated people, be less of a critical thing. Whereas the lower slopes of crossover that monitor tends to use... being a hair more problematic in this regard. But, they may have done HT speakers differently
Regardless, a full matched set of tweets and mids, is critical for good clean HT spaciousness and sound field environments..

Personally I like Tannoy. They sound a little more dynamic, more musical and more natural.

Regards - Steve