I pulled the trigger and ordered the speakers today, finally after a week or more of research and debating.
Due to price, practicality, etc. I went with ELAC Debut B6.2 L/R, C6.2 Center, and A4.2 Atmos (to be sitting on top of the L/R speakers).
The ELAC setup is very reasonably priced, I was able to get it with matching Atmos speakers within my budget, and they are very well rated.
The center channel is kind of high (8" tall) so either the TV will have to be dropped down to ~75" and mounted on the Fitueyes TV stand to clear the center channel, or I will mount the center channel on the faux rock wall above the TV.
Thanks for everyone's help and suggestions, I did consider everything. Will post pics once the TV and final items are purchased and everything is installed.