Eddie,
Kirk Sand introduced me to Rich Barbera the last time I was at CAAS in 2012, and I talked to him at that time about a pickup for my Takamine Classical. I had some contact with him over time, and eventually, I ordered a pickup. I had to carefully take measurement of my saddle and the original Takamine transducer thickness so that he could make an exact fit. I think he also has a preamp, but he said that it sounds real nice even when wired passive. I was able to wire it right into the Takamine preamp. I didn't much like the "plugged in" sound before, but now it sounds very natural. I really enjoy playing it plugged in now. The Barbera is the one that John Knowles is using, and I think Kirk put one in Richard Smith's new guitar. It's a great pickup!
Rich stays pretty busy doing pickups for violins, cellos, upright basses, as well as guitars. I know that he makes pickups for Kirk and another high-end builder. Now I'm hearing that he will be making pickups for a Guild Doyle Dykes nylon string signature guitar designed by Kirk (similar to the Gibson Studio Classic). I'm not surprised at all after how his pickup gave my guitar a new electric voice. You should contact him and see what he can do for you. Here's his website:
http://www.barberatransducers.com/Hope that helps!
Bill B.