I'm this close to buying an MTD Kingston fretless four, but I'd like to add a pre and possibly replace the pickup. I'm leaning toward the Aguilar OBP-3--I like the fact that it's a three band preamp with control over that very important midrange on the fretless, but also has just two pots, one regular and one concentric (if I go with the SK config). That's a plus, because the Kingston only has volume and tone knobs. Any thoughts on pickups? Anyone add a pre and leave the stock pickup? If I upgrade, I'm leaning toward the passive Bart Music Man style model. Other thoughts? Thanks.