Please note: I offer the following pickups for installation in Doolin Guitars only. I do not do repairs, modifications or installations on other builder's guitars.
My personal favorite pickup system is the B-Band. Their UST has the warmest, most natural sound of any under-the-saddle pickup out there. These pickups use no piezo material whatsoever, so they don't have any of that harsh quack we've all heard from other pickups. The new A1.2 preamp has a soundhole mounted volume control, and the B-Box battery box takes the battery out of the guitar for easy battery changes. Please see their site, www.B-Band.com, for more details.
For hexaphonic output, especially for driving a guitar synth, I offer RMC pickups and electronics. The pickups sound great, and the synth tracking is amazing. Please see their site for details.