For what it's worth....
IK Multimedia have produced a piece of kit called iRig Acoustic Stage. It sits on the lower edge of the sound hole and connects to a pre-amp which fixes on your belt. The Pre-amp has EQ presets for classical guitar as well as steel strung options or just set your own. I haven't used it for stage work, but I have used the mic for basic recording when i'm singing and playing on my C40. Not too pricey (99Euros 105USD or £86) and will allow some freedom of movement whilst playing on stage. If you google it the product page has some recordings made using it
Be interested to know what you decide upon..
PS If you have a soundcloud site i'd be intrested to hear what kind music you're making..