I think it's going to be an uphill battle for the next few years. Security researchers are really honing in on CPU bugs these days, and taking a deeper look into finding firmware vulnerabilities. CPU hardware and BIOS/UEFI/Firmware bugs used to be something out of a science fiction novel. Most security researchers were more focused on finding easier to spot and easier to exploit and presumably more widespread bugs in things like Adobe Flash & the webbrowser of your choice, along with Microsoft Windows. Then, someone got the bright idea to start poking around things like Intel Management Engine and some other fun Intel-specific motherboard backdoors features. They've finally made their way to the CPU.
I think it'll be important to decide whether or not you're concerned with the performance hit by whichever method of fixing they implement in whichever chip you buy. I think we're looking at probably 2 more years until this stuff really dies down. I foolishly thought we'd have kind of a "smoking gun" solution with the next batch of CPUs for Spectre/Meltdown but now with things like Foreshadow & other variants, that doesn't really seem to be the reality of it.
All that aside, I'm very excited for the prospect of building a super rig with a 2080 Ti & i9-9900K. However, AMD should have Zen 2 out sooner than later. Maybe that'll blow the 9900K away. And supposedly their upcoming GPU line-up will be awesome as well.