How do you guys feel about mixing brands? I'm trying to decide on new pups. I was going to simply get two Ultra Jazz, but now I'm torn. I'm thinking about installing a Bartolini MM Classic Bass and then possibly an Ultra Jazz or a Bartolini J pickup. I'm not really experienced in upgrading pups and need some advice. Plus, would you recommend that I put the MM near the bridge and the J near the neck, or vice versa?