My assumption was that the TV mounting and cable routing were the dominant part of that installation cost—although I think the Absolute On-Walls could be a good solution.
Yeah, my initial wording was unclear sorry. My budget is 800 for the receiver and speakers *because* of the TV/speaker mounting and installation. Otherwise it could have been higher. C'est la vie.
Regarding the center and placement, the speakers will be mounted almost directly adjacent to the TV and the normal sitting location is like 7 feet away. It's a longer room than wide and the TV/Couch are across the short length. A center will have to wait but I'm hopeful the sound will be good. Hell, anything's gotta be better than the TVs built-in speakers we've been running on for a year, right? :P