Thanks for all the feedback guys. I was unaware the certain credit cards added an extended warranty to almost any purchase. I called discover and they do not offer it for refurbished products. Visa however does. Now that the e300 is out of the equation, my two final choices are the avr-1712 and the avr-1713 both refurbs. Just by looking at the specs, it seems like the 1712 is a better buy for audio quality, since it pumps out 90 watts per channel (1713 pumps out 80) and is 7.1 (1713 is 5.1). It looks like denon added more features (networking, airplay, usb port) to the 1713 but made sacrifices in the audio department, which is what really matters.
Airplay and networking are not a big deal to me since all my other devices are networked. However, the 1713s usb port seems very convenient.
Pioneer Kuro KRP-500M
Pioneer Kuro PRO-141FD
Pioneer Kuro PRO-111FD x 2
Pioneer Kuro PDP-5020 x 2