Uhm.. So what do you wanna know? Good high end humbuckers or good low end humbuckers? Pardon me but I don't really get it yeah.
Low/Mid/High output? Active or Passive? Wide variety to choose from.
There're certain brands which you might wanna start from to research on. The more commonly found ones are Seymour Duncan, Dimarzio, EMGs..etc etc. And the likes la. Alot if you research on them.
They higher end ones.. You depends on what kind you want. There's brands like Suhr, Bill Lawrence(fan of them hehe), HAS-sound(awesome IMO), Anderson..etc etc. Google them up, you might find some interesting information. If you search around this forum quite a fair bit, you'll discover other brands as well.. There's just a wide variety to choose from la, research research.