What about Koch (cue Johnny MAc and Afghan Dave)
There was a clip of a simple class A amp - think it was the studiotone we all watched on Youtube
May be too low powered for you
Or look at the Cornell Plexi 45/50
Sounds great!
Of course I would say look to the Egnater Mod 50
Then you can have whatever preamp you like
The Twin/Deluxe is great as is the Bassman, although you may like the Vox Module or the COD (California Over Drive) which has a bit of a Boogie vibe, but isn't that gainy. I dont hear the Dumble references people make on that module
On the other hand the Sl is pure Plexi - great stuff