Hi,
For the two singles, I'd contact Pete Biltoft at Vintage Vibe Guitars and describe the wood, etc. of the guitar. He builds a very nice sp-90 that has most of the "guts" of a P90 in a strat sinble coil size. He custom winds tham for you and doesn't charge an arm and a leg. Also, you might want to check out some of the Rio Grande models. They are very good. As for the humbucker, if you're looking for super hot, try a Gibson 500t or an Anderson HN3 or HN3+. The aftermarket Gibsons and all of the Andersons, to my knowledge, have 4-conductor wire. Of course, you could always go the old SD way, but I find that some of these other options have tremendous tone and character.
Best,Dave