i made a nylon strung strat a while back using the ghost system and preamp, was bowled over by the quality. I also fitted a piezo system, i think it was a fishman set up, to a les paul for a customer. Which again sounded amazing.
Joe, i know your thing about no controls, i think either system can be run without controls, but need some sort of preamp for a decent output.
Think the ghost system is about £150+, and fishman a little bit dearer.