I just ordered an Onkyo 805 for my 80-500 system for 619, free shipping (refurbished unit) from shop onkyo. Unless you've got a big room like I do I'm not sure you'll need the 805. The 605 or 705 are well respected as well. But like others have said, I believe that just about anything of decent quality (yamaha, marantz, denon) will do fine.
Have fun!

M80v2, VP150v2, QS4v2, Onkyo 805, ADA1500-3, Sonos