hmm, lotsa variables, I can only offer opinions and suggestions. I don't like piezos much as the, um, primary sound source -- they're great to use with an electronic tuner, and ok if you just want the option to amplify without miking occasionally. I just don't like sound.

You might check www.b-band.com and discuss the b-band with your builder. I'm not sure how well their pickups can be adapted to bouzouki, but it's worth looking into, they sound so much better than piezos.