I have a Fender Am JBass its a couple years old. I recently got a Fender MM4 and love it. Now I want to start fixing up my old JBass by changing PU's and adding a pre-amp. I mainly play Funk and Jazz and use the MM4 for slap and want to mod this JBass for big phat, growly sound for Jazz, gospel, old school Funk. PU's I'm thinking Nordstrand, Bart, maybe Fralin. My repair guy is a EMG fanatic. They have good definition, but not a lot of bottom on the basses i tried. As for pre-amp Aguilar or ??? I don't seem to hear people talk about Sadowsky pre-amp much these days. Bart and EMG pre-amps I mainly hear people use them when using the same PU's. Any comments on what I should be considering?