I have a Nailbomb/trilogy set in my swamp ash/maple neck strat clone. That gives a great sound, with lots of harmonics. I have an Emerald in the bridge of an LP and there are ton's of harmonics from it too, but it is more the sweet Thin Lizzy sound.
Actually, all of the BKP humbuckers let you bring out the harmonics. I think it is the scatter wind that opens the pickup up and takes all that heavy mid dullness away.
Tim is working on a John Sykes style pickup at the minute, the Cold Sweat, perhaps this might work for you too.