Hi. I am a true novice when it comes to audio. I've been using an Onkyo HT-SR700 5.1 all-in-one system (Amazon link) with my primary TV for five years.
I don't often watch movies and I didn't use the receiver for TV watching. So, I found myself just bunching up the front and rear speakers on either side of the TV, and using them only when I watched movies.
With a new home and TV, I need to upgrade; Budget: $750. My new home has two per-existing 8" speakers mounted flush in the ceiling at seating distance from the TV and what appears to be a wall-plate behind the TV that has four audio ports (not sure why there are four when I only see two speakers).
What more do I need for basic TV and movie watching? Can I just get a large center speaker, and then, use that with the preexisting ceiling speakers, sub, and receiver? I guess that's 3.1. Is that sufficient for basic audio? Is there even such a thing? Do you recommend that I use front speakers? (Some of my concern is that I don't have much lateral space around the TV.)
Some things to consider:
TV: Panasonic 65ST50
Cable: DirecTV HR34
Other: PS3 and XBOX and HTPC
TV Stand: BDI Avion 8929 (has a speaker drawer that is 34.5 inches wide, but I could put a larger center speaker on top of the stand).