I have several different pickups. Soundhole, SBT's UST's. As SBT's go... I prefer the JJB Prestiege 330 over the K&K. It is less mid/bass heavy and gives a more natural tone IMO. And it cost less too.
Link that with the best pre/DI (mentioned) (LR Baggs is the staple) and you can really tweak your sound.
System effects like Reverb and lil chorus are a must too.
http://www.jjb-electronics.com/