Music mostly occasional TV, I like it, so a 3.2 would be ideal for you? a left and right with a center?
This is a proven combo I have put together a few times..
you can get a pair of ascend acoustic towers, with a pair of HSU uls15's, and since you have the tv a denon avr {you can get decent avrs for around $500}, that with a center will put you under $6000.... with a room that size if you had the room and budget for dual dual drives that would add a couple thousand but be insane...