You're going to want to look for a mini humbucker that has ceramic magnets... ceramic magnets are the highest output of all pickups. All "metal" pickups are made with ceramic because it gives great clear, biting tone... and it sustains well and doesn't mud up when heavy distortion is used... Look into some mini humbuckers... like the hotrails or the Mini JB/DuckBucker/'59 set from Seymour Duncan.