As far as the humbucker goes, it's really about personal preference. If you don't plan on playing clean, something like the Seymour Duncan Invader is a nice distortion pickup. Unless you have it coil tapped or split, it tends to have a "dirty" tone to it.
If I was you, I'd look on YouTube at different pickups and see which ones fit you.
I have put Dimarzio, Duncan, GFS and kept stock pickups in my guitars. I like to have variety.
Side note with GFS pickups, they are cheap and are made really well. I have been very impressed with them.
Good luck in the search!