The JB is, by far, the most popular humbucker out there. It probably outsells all other pickups on the market, and there is a reason for that: it sounds really good. Myself, I'd probably go with a Pearly Gates, which has a bit less output than the JB. I also like the Alnico II (that's what Slash uses, by the way), and the `59 is a pretty killer pickup. I'd also look seriously at Lindy Fralin's humbuckers. He is more known for his single coils, but he does some interesting things with his humbuckers; including uneven winding which gives them a clearer sound than most humbuckers, though at the cost of a bit of added hum.
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