Re: Which speaker for surrounds?
I'd recommend HTM200's even if you did have space behind them. The only scenario I could see recommending better than HTM200 in the back would be a multi-channel music junkie, meaning lots of DVD-As/SACDs. Besides the cost issue you have the fact that they're smaller and less noticeable.
The DTS/DD5.1 music DVD's I've heard put the lion's share of the audio demand on the front stage, so even in that situation, HTM-200s are fine.
Sierra-1 - Mains+Center
Surrounds - HTM200SEs (x4 in back, and x2 Atmos)
Sub - SVS PB-2000
Receiver - Onkyo TX-RZ1100
Oppo Darbee Edition Blue Ray
Sony 4K blu ray player