Great find! I agree Denon's X4300H is a great receiver and the $799 very price is good. It's a power house with 9 channels of amplification rated at 125 watts per channel at 8 ohms.
The successor is Denon's X4400H. The most important advantages on the new X4400H is that the HDMI chip is the full 18Gbps so the receiver is HDR compatible, capable and ready for all of the new UHD/HDR TV system standards. I also like the additional built-in streaming apps, especially TITAL and the receiver had some very cool diagnostics and comes with Alexa control interface along with a few additional 2017 enhancements.
Denon is my favorite price/performance brand among the premium receiver choices. In the new 2017 line-up I love Denon's AVR-X1400H, which is on sale for $499, but with power hungry speakers systems you can't beat New Eggs deal on the X4300H at $799.