Hey Kemperites,
We've finished profiling a couple awesome vintage Mesa Boogies.
The Mark I 1x12 combo is a pretty rare bird from the mid-70s. Has a very cool organic tone with less gain than you're used to from a Mesa. Sounds amazing when cranked up.
The Mark IIB 1x15 combo sounds more like a modern Mesa. Absolutely the heaviest amp I've ever had the misfortune to haul around, but also the best looking (and one of the best sounding!). Absolutely fabulous rock tone.
Check 'em out and see what you think at www.topjimi.com.
Jimi