Hey guys...I'm upgrading my Fender Aerodyne, because the stock pickups aren't very great. I also want to add an on board preamp while I'm at it. I've settled on upgrading the pickups with a Nordstrand NPJ4SE set. Now, I'm looking for recomendations for preamps to go with them. I've lately become a big fan of active electronics. But I still like passive at times, so a passive/active switch is a big plus. I'd like it to be a 3 knob configuration, so I don't have to drastically alter the bass. The Bartolini 3.3 A/P is looking sweet for this reason. Anyone have any experience with a bart pre & nordstrands together? East preamps look freakin' sweet too. The J-retro won't fit on my bass, since it comes mounted on that control plate. However the U-Retro looks like it will. The only problem is I would have to drill 2 holes in the body for the 2 switches. This makes retro-fitting if I wanna sell it later on a problem. I think I like the East system better, but I've never tried either. They sure get alot of praise. Any recommendations for other on board preamps that might fit my criteria. Is it a bad idea to add the U-Retro and drill holes in the body...or should I just say screw it. Any thoughts?