Charles May, pick your blade shape in S30V.
Dale Howe, pick your blade shape in Elmax.
If you can find someone willing to part with a Gene Ingram in S30V, or if he gets caught up on orders and starts producing knives for sale on his site they're actually my 1st pick.
I've gone through 1/2 Dz pocket knives from Benchmade in CMP154, S30V and M390, in all cases they don't hold an edge like an S30V or 154 from any of the custom guys. Blade material is only half the story, heat treat is the other half and IME, Benchmade doesn't get any of them hard enough to hold an edge like the custom guys do.
I've also had really good luck with a couple of knives in 52100, but, you've got to keep them clean or they'll stain quickly.