I went with a company (one guy) called Buddha. He makes a jazzmaster sized p90. He was really cool about communicating and helping me figure out what I want. I'm going with an alnico 8 magnet which apparently has pretty high output and more girth. Still has bite on the top end without being piercing. I hope it actually sounds like that. I want to choose piercing treble, not have it forced on me.
I'll figure out the neck pickup eventually. It took me actually playing in a full band mix to appreciate the importance of a good bridge pickup.