Mini Humbuckers offer you the best of both worlds; they are humbucking (i.e. no 60-cycle hum), they are capable of great chime and clarity when you play clean, and when you use a lot of drive, they sound fantiastic. They will never sound quite the same as a full-sized humbucker, but they have a fullness and grit all their own. You really have to experiment and find the ones that are best for you, but it is worth the effort.

If you are looking to upgrade your pickups for Metal, here are the most popular ones out there