I have known of the 1x15, which is a nice amp, but even louder than the C-30, and I think has no onboard reverb if I remember correctly. A lot of people really like the sound, but you would have to be able to be loud enough to enjoy it I would think.
With the Classics, I strongly prefer Peavey's 10" speakers over their 12" version. At similar price, I would take a Delta Blues 2x10 over a Classic 30 without hesitation.
The Classic 30 is a really good amp and the right speaker makes it great. The Delta Blues I played sounded great right out of the box. There's a real pleasant vocal midrange quality to it I love.
IIRC, the Delta Blues (at least the 115 version) has not only reverb, but a rather tasty tremolo, too! Those are really nice amps, but as someone mentioned before, LOUD!
I've had mine (DB 15") for years and I love it. Big sound, gobs of clean headroom, passable reverb and tremolo, and it loves pedals. And they're dirt cheap.