I've always heard that the Miracle Man is THE bridge pickup for basswood. However, I have to say that I've yet to hear an impressive demonstration of the MM (at least not one that rates $150). Seems too scooped and cold but then that could be how people dial it in.
The gentleman from Axepalace recommended the Ceramic Black Hawk due to it's warmth. I like what demos I've heard from the Black Hawk, but I don't recall any demos being basswood guitars tuned low.
Guitar is an Ibanez Prestige RG2550 tuned to B Standard or Drop A, currently with a Duncan Distortion in the bridge and a Jon Baxter PAF in the neck. I'm looking to sell my ENGL Screamer head soon but I haven't settled on what my next amp will be (possibly a used evh mini 50w) cab is a Lopoline 2x12 w/eminience v128's. I play bedroom High gain Rhythm, sometimes slow, sometimes fast, if I've been practicing.