Re: Stereo poweramp with mono cab??
Instead of getting another cab you could split yours, just separate its speakers and add a another plug.
Seriously a stereo cab is just two separate sides so just separate yours, it's not rocket science.
Instanctly stereo cab.
BTW some stereo power amps like mesa, when you use ONLY 1 side you have to turn the presence of the other side all the way up so before buying anything, read their manuals.
You really don't need a tube poweramp with a digital modeler, it'll add nothing to the sound but they're more expensive and fragile.
A VERY good option would be any ADA poweramp, I had some for decades and they never let me down.