I hope I made good choices with new gear. Comments?

Let's start with power. Whole house surge protectors are cheap insurance not only fo your audio/video, but you refrigerator, stove, dishwasher, washer, dryer, water heater, and HVAC also. All of those have micro-electonics in them that do not respond well to surges. Brownouts and outages are different. They require backup power ($$$) and are best handled on a priority basis, e.g. refrigerator, yes, dishwasher, not so much. Internet equipment, absolutely. I run my router off a 600W UPS that keeps it up for about 12 Hours. I have a gas on-demand hot water heater, it draws 6W standby, 20W in use, so it will run for a week on  600W backup.

A Dedicated 20A circuit for your AV is also basic. And unless your UPS can handle 2KW for an hour wile providing true sinusoidal 60Hz power, I wouldn't bother. 

As for speakers, I've never been an L-100 fan. In 1980 JBL intro'd the L-110 which not only kicked the L-100s butt, but also the well-beloved ADS L810s. They went louder, deeper, cleaner, and imaged incredibly. But JBL fanboys didnt like them because they 'only' had a 10" woofer. Point being, there are better speakers for your needs. If you like JBLs punch, but want something more refined, .Monitor Audio Silver 300s are a screaming deal. Or step up to their Gold series for even nicer finish and a ribbon tweeter.

@sls883 Oh, I'm sure I'll be quite happy. This will be the best gear I've ever owned. Research says the synergy should not only be good but outstanding. The vintage equipment I run actually did provide very noticeable differences when I upgraded to Morrow Audio speaker cables and even just Audioquest Tower interconnects. The better grade cables and such I'm getting now should make me ecstatic. 

@buellrider97 The Shanling CT90 Premium CD Transport does have USB as does the Benchmark Media DAC3B. Probably give it a test eventually. 

The  Shanling CT90 does not come with streaming or Wi-Fi. Bluetooth it does. 

@panzrwagn Whole house surge protection. Just got a chance to look into that. MUCH cheaper than I would have guessed. Calling our electrician Monday about a Type 1 whole house  surge protector. Do we also need the Type 2, indoor unit? 

Battery backup. Firm believer in it. We have them all over the house. We don't need them to last very long though, the standby generator kicks on in like 7 seconds of an outage, That's 14,6 kw, enough for the whole house. 

Speakers. I really do appreciate your thoughts on the matter. I think I should wait until all this new stuff is setup for a bit before thinking about new speakers. Maybe then I'll know if or what I want different.

Your room/system journey had some obvious parallels to my own, in which I took 25+ years to do massive woodworking built-ins throughout our very large secondary living room, which was originally to be my sound room, but has since become a beautifully decorated video parlor & hangout area.

The main parallel: a 77" LG OLED (mine is a 77" C8 purchased in late ’18). That was and still is a total game changer, easily the best video device I’ve ever owned or seen. 

Clontinuing the parallels: I, too, have a 4K blu ray player (Panasonic UB420-P). I used it only rarely, but when I do, the visual results are astounding. As good as 4K streaming is, 4K blu ray is even better.

Enjoy the fruits of your labor!

@desktopguy  Thanks for the nice post. Yes, this will my nicest TV I've ever owned also. Mom has a 55" LG OLED and it sold me on this one. 

Looking forward to watching a few 4K Blu-Ray videos. Except for the complete Jack Nicholson catalogue, I don't buy many movies. For 4K though I did buy a few that peaked my interest. First, I bought Mad Max Fury Road (2015). I've read that it's the 4K movie to judge all others against. I also bought Fall (2022). I have vertigo and enjoy messing with it. Even on a 55" TV that movie goofs up my senses. I also enjoy things about our solar system, the universe and space in general. Not much I could find in 4K about that topic that's non-fiction. I did find Apollo 11 (2019) and For All Mankind (1989 but redone in 4K). I may get some other space films in the future. They won't be in 4K but I'm hoping the up-scaling feature does a pretty good job. 

Besides audio, my main hobby is model railroads and trains. I currently have 412 railroad videos. Those wear out DVD players, LOL!

"railroad videos" (amazing!). I could get carried away w/model RR & trains, but never gave that infection a chance to start.

As for 4K video, I had to get the Jason Bourne collection (all pretty wonderful & wonderful looking films). My most recent purchase was a rather beautiful film I saw in the theater, ARRIVAL.