@Kfox1970 Whatever speakers you buy, most Denon and Yamaha AVR's will handle with ease.
The Denon AVR S960H , 7.1, would be a nice edition. If you are having to go with 8+ speakers, which includes the subwoofer, you'll need a 9.1 channel AVR and more money. The Denon S960H is straight forward in setting -up with designated hook-ups on the back panel.
$549.00 may sound like a re-furbished unit, but to each his own. Good luck and hope you find what works best for your budget!