There's lots of great folks at the show, but two I'd say to definitely check out is Smith and Sons (family run business out of Louisiana) and Big Chris Custom Knives (no joke, BIG dude out of Tennessee. One man show that works out of his garage). These two builders are just good people, the kind of folks I like to support.
The higher end custom guys
Greg Lightfoot
Kirby Lambret
Peter Carey
Jon Graham
Jeff Vandermeulen
Peter Rassenti
Gerry McGinnis
Jeremy Marsh
Todd Begg
Steel Flame (Derrick)
GTC knives (Gus)
Michael Burch
I'm sure there is more..... other then the obvious Hinderer, Emerson, Marfione, etc.