Thank you for the comments and information,
A note on the budget mentioned. I said "up to" $2500. Spending less for what I'd like to get is most certainly a better route.
The last receiver was around $1500 nearly 4 years ago, so I used that as a (inflation corrected) maximum. (Actually, $1909, but I was just pulling a number out of my, err... out of thin air.
And a bit about me, which I should have included in the original post. No, I'm not a gamer. I had a PS2 to play Gran Tourismo 3 back in the early aughts, and a Wii for a while for the kids after that. But haven't played a computer game since.
I'm 66 years old (today!), so you can imagine that my listening tastes and equipment have varied a lot over the years. My ears are still sharp, and I can easily pick out instruments across the frequency range. The loud background music/effects over the voices in modern TV shows drives me batty, though.
These days, I listen to mostly lighter music; Classical (think Brahms, DeBussey, and Vivaldi rather than Bach, et al), still the occasional New Age (Michael Hedges harp guitar stuff still gives me goosebumps!), some jazz, old country, and whatever you call the sort of modern folk stuff I'm attracted to lately (Canyon City, Kodaline, Nick Wilson, Tall Heights, etc.) And a fair bit of '90s-'00s alternative (Live - Throwing Copper, Hum, RATM, Alice in Chains, Weezer)
I don't listen to "Classic Rock". I was there, and tired of it then. Rarely do I need a reminder. I never got into speed guitar, heavy metal, and can't stand most radio pop. Oddly, there 's a few "screamo" songs I enjoy...
If I'm watching a movie or show by myself that benefits from being played loud, I most definitely do. But if watching something with Deb, just normal volume is used. (I watched Avengers Endgame last night, and the battery candle that Deb had set on the sub fell off early in the movie.
I've attached an old photo of my current setup. There's also the sub, four surrounds, and two sunroom speakers.
A couple of you have mentioned sticking with Yamaha, as that's what I have now and like. True, but it is almost 14 years old, and anything new will sound completely different. I read one post where someone noticed a big difference between their 2017 RV-V and new RX-A, so imagine how much mine differs from current design. I've never listened to a Denon, and the last Marantz I spent any time with was a pre-digital stereo unit in the '70s. I'm not a fan of not having the screen on the Marantz unit though. I don't necessarily want to have the TV on to change radio stations. So, I'm pretty wide open brand wise.
I think having nine powered outputs will be the limiting factor. That gets me into the $1500+ range with any of the aforementioned brands. It sounds like waiting for the next HDMI won't gain me a lot over the next several years.
Oh! Do those up-facing add-on speakers to simulate Atmos work? I might be willing to add those on if it makes a big difference in viewing realism. I can't get into my ceiling to add speakers there.
One thing I didn't think of; we have all of our kids movies on VHS and VHS-C, and I still have a working VHS player. I know S-video isn't a thing anymore, but having analog left-right-video inputs would be nice. Or, buy an RCA to HDMI converter. I *really* ought to convert this to digital, along with our wedding video on Betamax!
Okay, I'm rambling here... Thank you, everyone, for giving me a lot to think about. I've got plenty of reading to do before deciding what, if anything, to do.