I am looking for a set of humcancelling J pickups to throw in my 4 string passive Warwick Rockbass Corvette. Ideally, I want something that will keep/increase the inherent growl, have a decent output, and also be capable to achieve a pretty bright tone when desired. I have read a lot of threads and listened to a lot of sound clips and narrowed it down to these two. From what I've read, the Model J's can have a lot of growl and are quite aggressive when using 500k pots. I also heard though that they don't have an extremely bright tone, they're a little darker, but I would install switches to switch between series/parallel within each pickup and possibly a series/parallel between the two if I could as well, if any of these could aid in getting a brighter tone when I really want it. I've also read the Seymour Duncan Basslines are very highly recommended by Warwick players as they keep/increase the growl and just make them sound even more brighter and more aggressive. However, there are several different models of SD Basslines, and few people give this much detail. Since I'm looking for humcancelling ones though, the STK-J2 Hot Stacks are my only choice on bestbassgear.com, so I'm wondering how these compare with Warwick owners. Any recommendations, details, and opinions on either set, particularly how they sound in Warwicks would be hugely appreciated. Thanks in advance.