Looking at the DENON AVR-S510BT receiver. Priced at $250+at Best BUY but I hate those guys only for their price gouging practices with HDMI, cables, wire etc. Accessories4Less has it for only $199, but is refurbished. I would much rather deal with this company but a bit leery(sp?) about something refurbished. They also recommended that for $100 more I could upgrade to S710. Would it be a better choice. Any thoughts about this? Thank you