From time to time I consider upgrading the pickups on one of my basses. My question: How the hell do you guys choose a pickup? How can I have a clue what a pickup is going to sound like in my bass? I have a P-deluxe and the bridge pickup is kind of thin sounding for my purposes. How would I know before buying a new one and having it installed that it would be an upgrade on the present, and not a downgrade. Same for all my basses - how could I possibly know the difference in sound between an MEC and EMG jazz pickup. Pickups are going to sound different in different basses, so checking the sound in another bass would seem pointless to me. Any thoughts or help would be appreciated. Thanks.