oh and if it's an amateur band tell them to turn the monitors down that's usually what causes most sound disasters with inexperienced groups.
get what you need (and only what you need) start with you Snare Hat and then play a song see if you can get away with that add what you must have from...
If you just need to be a bit louder you a mic is the way to go,
however avoid any of the ones that go in the F-hole or contact type mics they sound like poo (of the thick muddy type) they get all B mode no A mode of the sound
if the repertoire is mostly acoustic and you want it to sound like a...