Where to start? With a receiver of this quality my options are so many. I think my ideal setup would start with a new UHD screen, at least 70 inches and up to 80. Coupled with a second sub and overhead speakers, then move on to equipping the viewing room with stadium seating and wall treatments.
Sound is the real treat in home theater! A receiver that is as up to date as this one would be a great way to improve on my set up and provide for a listening experience that would blow the family away. This and my new OLED television that is!
If there is one thing that has really improved movies recently, for me it has to be the audio quality and the immersiveness of the sound. Of course, visually the quality has improved, but I always tell people who are skeptical about HiDef content that the sound is what you'll be most impressed...