Have you ever considered 845 monos ? 97% of the 300b magic with the bass of a solid state, top end never in your face. I have had lots of the gear listed above , Marantz 9's, 8B, McIntosh MC30, 40, 60, MC225 and MC240. Leben, Levinson (original ML2 monos), Heath WM5, various Fisher, Scott, Layfayette, Line Magnetic, Ayer, Exposure, Audio Research, Conrad Johnson and more... If the ML2's would have been more stable fewer breakdowns, I'd still own them.
Of everything I have tried, the McIntosh MC 30's or MC60's and my current (last 6 years) Dehavilland Aries 845monos are my faves. ~20watts of real Class A with a nice big fat 845 tube on each. If you are after solid state, Pass Aleph monos would be a great choice too.
The 845 Aries has enough clean power to drive you out of the room, with all kinds of timbre and dimensionality, bass slam etc. It's not the watts , it's the clean headroom that matters
IMHO