Hello Ascendants (?)

I'm currently building my home theater, and am looking at buying the Sierra Tower and center with the ribbon upgrades for my LCR speakers.


I'm a bit undecided which speakers to use for my surrounds & back though. Looked at going with 2 pairs of the CMB 170, but then again am wondering if I should stretch my already stretched budget 'bout $600 bucks more and go for Sierra-1 surrounds (b-stock). Or maybe Sierra 1 for surround left/right and CMB 170 for rear...

Can someone who knows these speakers please chime in on how these blend together in terms of sound?

I'm also looking to get two Rhythmic LVX12 subs (instead of SVS PB2000), and 4x RSL ceiling speakers for Dolby Atmos.


Cheers!