The trick with smaller monitors is to get them in real close..... That's WHY you want small ones. Just like nearfield monitors, you don't need big speakers at moderately low volumes (a lot depends on how much of an 'Animal' your drummer is!) if you can get them REAL close. Raised up and at each end of your keyboard works well. Lovely stereo, very little bleed to the rest of the band (they can put you in THEIR monitors if they need to hear you) and not too much bottom end to muddy up your sound.

Alternatively, you want to save your hearing for a few more years, try a nice set of in-ear monitors. Ultimate Ears, Westone, Etymotic Research.... get some custom molds to fit your ears and enjoy going home without your head ringing....