Thanks everyone!! I do have the center channel angled down. I don't run any fans in the cabinet. The Pioneer runs really cool.....even when I run it hard. There are large slits in the back of the cabinet for cables & they do a great job of keeping things cool.
That wall is huge. When I first got the 61", my sister came over and said, "Man, you need a bigger TV, it looks so small against that wall". I said, "that is a bigger TV....it just replaced the 51" TV!!!!!!" But, as you can see how open everything is, I really need to get a second sub. I'm very happy with everything right now. It's way better than going to the movies & putting up with rowdy crowds.
The only thing I don't like about the cabinet is that it does require frequent dusting!!!! Black is pretty, but hard to keep clean!!!