I'm a happy QSC K12 user. I've never had a drum monitor that was so loud or clear. It's got a deep switch too, but that's almost too much for most situations. Very versatile for P.A., vocal, multi-instrumentalists as well with 1000 lightweight watts, a 12" woofer and horn tweeter in a kick-back, stand upright, or pole mount configuration.
Yamaha, EV, Alto, JBL, make similar powered monitors. Hard to beat the clarity and brute punch of the QSC in such a small package.
I've abused mine pretty hard for a couple of years now.