I've been away from forum lurking for a long time; same for use of my system as well. Having recently purchased a new 4K TV it's time to get back into it, but I'm kind of stuck on what to address in the upgrade process?

My 990 and Denon CD player were retired years ago. I've got the 975 (Ben helped me verify that its firmware version is 5.3), an OPPO 103 (Darbee) and the 7125. Speakers are all Aperion's and the sub is SMS-1 (7.1 setup).

The only item I've been seriously researching up to now is replacing the OPPO with a 4K player. When checking back here I then realized the 975 will need upgrading as well (HDS-42AVR?) if I'm going 4K.

While I spend a fair amount of time listening to music and watching movies I'm probably spending more time on my XBox One X these days.

So, where do I go from here? Get a sound bar for the XBox One X and then focus on the music and video side of things? Should I think about the 976 or look at other parts of the system? I'm pretty much a novice when it comes to the tech side of the AV world so any thoughts or suggestion would be appreciated. Cheers.