I play

1. Reggae (Roots, Dub)
2. Ska (2-Tone, Third Wave)
3. Punk (Classic punk, pop punk)

I have a SSS strat and a Blues Jr.

My single coils sound horrible with my distortion when I play punk, and I'm not diggin' the cleans either.

I checked my strat body and its routed to have a humbucker in the bridge if i want.

Preferably I want ONLY a bridge humbucker and a volume knob (I like simplicity).

and I DO NOT PLAY METAL so don't recommend something for that genre.