@riccitone,
You definitely IDed most of the top contenders in the range. I agree that most of the better R2R will beat most non-R2R.
FWIW, I recently upgraded from Schiit Gungnir Multibit to Denafrips Pontus II and it was a huge improvement. Never got to compare the Gumby to the Ares II, but those are both in your wheelhouse if you stick ~$800. You can find both used frequently as many in this range are often looking to upgrade. The Soekris suggestion is a good one at slightly higher price.
I borrowed a SMSL400 while I awaited the Denafrips. It's okay...functionally excellent, but sound is dry lacking body and not even in the same class with better gear. Less meat on the bones. I'll stick my neck out and add that I suspect most SMSL, Topping & Gustard recommendations aren't from folks who've compared them side-by-side vs. the better options. They're good start options at low prices, but not made for aspirational systems. Cheers,
Spencer