Lots of good one's out there. As to who is the "best" well that is a subjective thing. I worked in a few few custome shops and know who I would and would not send people to. However, that is only my limited experience with the people I have worked with. I doubt anyone here has had numerous custom bikes.

Personally, I think the inperson fit is extremely important. This way the builder can put you on a bike, look at your position, take a look at your current bike and how it is set up. Also he can at that point play with angles and such, see how you look, ask how it feels, and have a much more in depth discussion of how you ride. All of this is much more difficult to impossible over the phone or via email. Ask around to your local buddies and see who has the best reputation locally, and go see him in person.