I am helping a friend look for a receiver this weekend and need a good starting point. He will have about $400 - $600 to spend. I just need to know what models out there can run a second set of speakers that he has on his back deck in addition to the speakers for 5.1. I have some decent knowledge of receivers, that why I just need to know which ones can handle the second set of speakers in that price range. Unfortunately he cant afford to get what I have, a Denon AVR-3803. Thanks.