The universal audiophile internal conflict - separates or integrated. We all get there at some point in our journeys. I don't have experience with your equipment but here are my thoughts anyway, FWIW.
The Parasound A23+ seems like a decent choice, you have it already, so keep it (for now).
As for a tube preamp from the options you listed, the Rogue seems like a solid quality choice and made in Penn.. If you were to increase your budget by 20%, the LTA Micozotl preamp (made in MD) has always intrigued me [it is fun to spend your money :)]
If you eventually upgraded your amp, the Rogue or LTA would be ready. If you went the integrated path, I would increase your budget, maybe for something like the McIntosh MA5300 at $7K and made in upstate NY.

