Start checking all your near by audio stores to see if they still have a pair of Klipsch RB-25 bookshelves, or some floorstanders, from the Reference 3 line - they should all be on close-out.
I'm happy with my Denon receiver, but I'd really look at the Pioneer 1015 if I was shopping now.
You've got a center & sub that are way beyond HTIB. Focus on a reciever & L&R fronts. If you take care of these, almost any surronds will do.