RE: the sub upgrade, why not just add a 2nd Hsu VTF-3 Mk5 HP instead of most of those options you're considering, except maybe the dual SVS Ultra-16s?
That would seem much better bang for your buck (unless you want substantially more powerful, deeper-and-more-accurate reaching dual subs), and that's probably what I'll do myself for my new dedicated HT room (~18.5x17x8ft)...
_Man_
I definitely hate being the guy talking folks out of HT upgrades but I cannot for the life of me figure out what you hope to gain from having more than an already existing and awesome 15" sub today in a room that size. If you aren't getting enough juice out of a HTF15 there is something definitely wrong. Are you going to listen at reference level at 10% volume?
My Marantz SR-8012 has dual subwoofer EQ's that are separate from each other. But I know I can get a better sub than the HSU VTF-3 MK3. And the point of dual subs is for smoother more powerful and accurate bass and to have better low bass distribution across the room. Oh the HSU VTF-3 MK3 will vibrate the bathroom door on the other end of the house but I want better bass distribution across the room. And I also hate the look of the cabinet and the cheap vinyl wrap instead of a wood like veneer or gloss finish. I got this HSU VTF-3 MK3 used through my neighbor whos boss was upgrading his sub so this HSU VTF-3 MK3 was $0. I have been going by the box and did not pay attention to the subwoofer so what I was thinking was a HSU VTF-3 MK5HP is a HSU VTF-3 MK3. Mmmmm going to correct my htf signature. The HSU replaced my previous Polk PSW505 12" Subwoofer. With the income I have I love what I have accomplished over the past two years before covid19 but at the same time I have gone without and spent every last dime. But I have not racked up any debt and saved and saved and everything is paid for 100%. I love watching movies on my system and enjoy it very much. I do know there is room for improvement here and there and will make changes when possible.
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