P90's are generally pretty bright & jangly sounding, so I'm not sure you'll like the DiMarzio Bluesbucker at the bridge position, if it's supposed to emulate a P90 sound. You'd probably be better off buying separate bridge and neck pickups, based on what you've described, because it sounds like you want to move the two in tonally different directions. If you go to the DiMarzio site and use their "Pickup Picker" feature, you can just select the applicable characteristics of your guitar and the tone you're looking for, and it will give you three options that match up most closely with your answers. The Seymour Duncan site has a similar feature.
While I'm not personally familiar with the DiMarzio humbuckers, I've had good luck with Duncan pickups. I have the combination of a '59 (n) and a Pearly Gates (b) in my Epi LP, which is an excellent pairing for vintage PAF tones with some added bite at the bridge position. In my Epi Dot, I have the very popular combination of a Duncan Jazz at the neck and a JB at the bridge. The JB is definitely a hotter pickup with a more aggressive tone than the Pearly Gates--great for hard rock, where the PG is terrific for classic rock and blues. I've also read excellent things about the Duncan Custom 5, which is a pickup I want to try for myself at some point. Sounds like it's a very versatile p'up that does a lot of things well.
Hope that helps some....