There are so many pickups out there, it's hard to know what to recommend. Application, and the type of bass you own are critical. Is it laminated, or carved? I work on a lot of local players basses, so I get to hear a number of pickups, on many different basses. Rockabilly players have been using the K&K bass max, or the rockabilly version with the additional fingerboard transducer with really good results. I have installed the String Charger pickup for those players- that need to play really loud, as well. They use mostly Kays, and Engelhardts. I've installed these K&K's on a few American Standards and King's. For jazz players, I have installed a number of Realists with varying results. On my carved bass, which is dark sounding, I don't care for it. I like the Underwood on that bass. There is one Kay C-1 played in a Jazz setting here in Reno that sounds great with a Realist on it. The Fishman full circle is a very good sounding pickup, and is a vast improvement over the BP-100. I recently had the pleasure of meeting Rich Barbera, who makes a fine transducer bridge. I have not as yet heard a Wilson, or Schertler, although I understand both are high quality products. I have made experimental piezo pickups, and have had mixed results with them, some good, some not so. I have an old Polytone pickup, and it seems to sound 'distant' as if my bass was being miked in another room as I played it...If you know a local bass repair person, have them relate their experience to you on the subject. Good luck!