I'll bite - mostly I use a Tone King Meteor II, 2x12" combo. It's switchable 20/40W w/ 4x6V6's. I prefer the tone with full power - better bass response - so I often set it up so I'm playing full power for clean, than I footswitch to the other channel and to half power for lead/ solo sounds. 40W clean, 20W leads.
I have a 100w Dumble style head that has a master vol, but at the same volume level it has much stronger bass than the TK. I have a Blonde Bassman rated at 40W that is louder than all get out - don't get to use it much. I use a Suhr Badger 18W w/ power scaling sometimes.
I have a 50w Glaswerks on the way - we'll see about that one when it arrives.
Ya know, at this stage I want to point out that while volume and power are related, but there are many other factors involved that are just as important.
The transformer, speaker efficiency and number of speakers and the cab style all play a HUGE roll in volume, as well as the design of the amp and tube type. Amps that have less headroom seem to 'fold up' earlier and may be perceived as not as loud, where amps with 'hard' output tubes and more headroom may seem louder. Amps that are voiced more bright can also seem louder.
I think what the OP REALLY wants to know is how loud do you gig, and what do you use to get there, and how does it work for you.
From 12-80w. For school gigs, church, bar band stuff I'll choose between a Princeton Reverb, a Trace Velocette, Traynor Guitarmate etc. For the outdoor gigs, Vibrolux Reverb, 50w Marshall, Brown Super or Alessandro Bloodhound (because I need enough clean overhead for the country guy who borrows my rig).