I'm looking to get a preamp for my MTD Kingston 5 fretless. The internal debate I'm having is whether transparency or musical-sounding coloration would be more appropriate for my needs. In the Transparency corner, there's the Aguilar OBP-1. I know that for all intents and purposes, if I don't touch the control knobs, whatever comes off the K5's pickup is going to be present at the output jack. I dig the Kingston's passive sound, so that might be acceptable. In the Musical Coloration corner, there's the Bartolini NTBT. I'm very happy with the NTBT that resides in my FBB custom 5. The NTBT adds a big hump of midrange, which would be pretty nice for a fretless, but I'm not sure if it'd work well with the Kingston's sound, which is already quite full. Thoughts? Opinions? I can get either for the same price, and changing twice as many batteries on the OBP-1 really doesn't bother me.