Re: NGD - Ed
IMO, Gibson is still doing a good job with their P90s. The vintage style Duncans I have tried are too mellow and don't sound "right" to me. I say this having a 1954 P90 in the guitar I grew up playing which my brother still owns. The modern Gibson p90s are not as sweet but they still have decent "bark" when you jack 'em up.
That said, For what Gibson charges aftermarket, I would probably go with Lollar or Fralin,etc.