I generally use what's handy, its amazing how stuff just piles up.
Dec was in town for the Clave last fall and he took a few small groups out. I kinda just fell into the opportunity.
I've been fly fishing for 20yrs or so and spey fishing for 5 or 6. Its amazing how much you can learn from people like Dec. Locally, I would suggest looking up guys like Rick Whorwood,Bill Katrauras,John Vaulk, Jin Lee, just to mention a few of many great fly fishing, spey fishing and fly tying personalities.