Looking for best bang for my buck on upgrade

Like I said! 🙂

That CPU is only a 6-core/12-thread CPU that's now past its glory days (and the very last 6-core/12-thread CPU outside of certain Xeon models to ever see release on any Intel HEDT socket). Even today's mainstream-platform (as opposed to HEDT-platform) 6-core/12-thread CPUs beat that i7-7800X by a significant margin in overall multithreaded performance these days.

As for your planned i9-10920X, forget about it. It will not be a sufficient upgrade over your current i7-7800X to justify paying $700 to $800 for it (as in, the performance improvement, although significant, is still not sufficient enough considering other cheaper options equal or beat it on a performance-per-total-parts-upgrade cost basis). In fact, it actually costs more money than an i9-10850K (which will not fit your current motherboard's socket) plus a decent budget Z490 motherboard combined. As such, I would dare say that the only CPU that delivers a worthwhile enough performance increase over your 7800X, the i9-10980XE, costs more money than a completely different CPU platform (CPU and motherboard combined) that comes close to or equals it in overall performance.

And this is all because Cascade Lake-X is not really a new CPU architecture, but instead is a tweaked-twice variant of the Skylake-X architecture that your current 7800X is based on. In other words, Intel's recent HEDT (X299) platform is largely a waste of money to begin with: You're stuck between a rock and a hard place with regards to a CPU upgrade regardless of which CPU you originally went with. There is absolutely no economically worthwhile CPU upgrade for that platform: You either spend a ton of money and still fall behind in performance, or stay put and fall even further behind.

Even more unfortunate, the i7-7800X and the X299 chipset came out just after AMD released its first-generation 8-core Ryzen CPUs along with its accompanying AMD 300-series chipsets. The i7-7800X still falls behind the most powerful of the first-gen 8-core Ryzen CPUs in multi-threaded performance (although Intel CPUs still had better single-threaded performance versus the first-gen Ryzen CPUs). Plus, unlike the higher-end Intel HEDT CPUs, both of the i7-78xx CPUs that were released (the 7800X and the 8-core/16-thread i7-7820X) have only 28 on-CPU PCI-e 3.0 lanes (versus 44 on the others). In comparison, AMD's Ryzen (mainstream) CPUs have always had 24 on-CPU PCI-e lanes, where in a typical motherboard setup 16 of those go to the GPU (or GPU slots), four to an m.2 SSD and another four to a USB 3.2 hub.

Now, had you gone with an i9-7960X or i9-7980XE instead of that i7-7800X as your HEDT CPU choice, then I would have told you to stay put. As it stands right now, you're trapped in no-man's land, especially since that 7800X is barely more powerful than the best quad-core CPU to justify the cost of HEDT entry.

I moved this to the Hardware forum.

Your system looks pretty balanced. I would actually say your GPU is the only thing 'out of place' ie: being better than the rest.

It's tough cause our systems are not that old, but things have moved on. I think when you are ready, it's time to move that rig down the line and build a new one. I'm in a similar position, from my 2017 build, I think out of principal I'll wait one more year.

You might ask this in the Hardware Forum.

https://community.adobe.com/t5/video-hardware/bd-p/video-hardware