I would redo my theater with the below, me watching movies only.
1.Sound Proof to the maximum.
2.Better Gauge speaker wires (10/12 AWG, mine runs on 16AWG) room size is 20.5LX12.5WX7.7H
3.Subwoofers better buy the biggest you can, of course the $$ (I have a placed an order for 18", presently running on dual 12" subs).
4.Dedictaed 20AMP power lines everywhere you can think off (Sub-woofers, Racks)
5.Theaters seats try them before you buy them.
6.Automated screen masking
7.In the excitement to get theater finished do not rush into finishing theater.
8.Trust the experts but verify.
9.Anything in your field of vision like scones/reflective materials will distract you.
10.Learn REW or get some expert from AVS to do it for you.
11.Run conduits for speaker area and overhead and everywhere you can think of
Most of the items has been documented in this post.
I found AVS members to be extremely knowledgeable than the dealers/installers I have came across.
The journey continues to build a perfect theater