Clearly you've never listened to Steve Vai's "Passion and Warfare" album. That was recorded with stock blaze pickups on his 7 string. That album sounds absolutley amazing.
I have a blaze bridge and air norton 7 for the 7 string I'm building. I can't wait. If your looking for high output pickups, DiMarzio might be the way to go. Check out the Evoloution, Steve's Special, Blaze, Breed, Air Norton, Super Distortion, Tone Zone. Check out their website, it's actually very helpfull, it gives all the spec's to their pickups. www.dimarzio.com
Ryan