You guys are probably getting tired of me plugging Mojave ampworks in here, but check out the clean tones of the Plexi 45 model....very spunky sounding, really fat...or is it phhhaaat. Expensive as the dickens $2000plus for the head, another $1100 and change for a 4x12....driven hard with a fuzz it nails Johnson's lead tone dead on.
Riveras and the Mesa Maverick and Blue Angel, even the Nomad series all have fantastic cleans as well. Riveras and the Nomads have smoking distortions as well....really really smokin. A few of us in here have Nomad 45's and they are incredible...a few also have Rivera TBRs which are unbelievably incredible...all of these can be had at reasonable prices and are some of the more versatile amps available.
Agree with Greg as well, I like the clean tones of the Legacy amps too and those are very reasonably priced. Keep in mind, if you go with multiple heads and just one cabinet, you'll want to invest in an amp switcher to control signal routing and protect your output stages. Getting combo as a second cures this problem, but it's bigger and requires more lugging around.