Super hot pickups aren't always the way to go IMHO. A lot of the aggression you seek might be lost because overwound pickups have less top end, and a lot of overdrives/distortions sound too bloated/farty when fed too much low end.
Look out for an Entwistle PBX or PBXN, the latter being discontinued, but with rather hot neodymium magnets, both very cheap!
Or there's the Duncan SPB-3, their site says they're Alnico 5, but I was always under the impression they were ceramic?
If you haven't got the bass yet I'd consider looking for a Yamaha BB414 or 424. Hot ceramic P pickup as standard, and an even hotter J pickup that sounds like a rock monster when paired together!