My first post as a supporting member. I'm considering buying a custom jazz with single-coil Barts and a passive preamp in it. If I were to buy the bass, I think I'd like to upgrade the preamp to something active. I've heard a lot about the J/U-Retro's, and I'm intrigued by them. However, I don't know much about the Aguilar OBP-1 and OBP-3, the Sadowsky 2-band, or any of the Bartolini models. For all who have played through any or all of these models, which ones do you prefer, and why? What are the pros and cons of each, in terms of sound, flexibility, etc.? For what it's worth, I'd be using this bass mostly for thumbstyle and jazz-ish stuff... no rock.