Fly Fishing in Montana

[pdempfish]

A friend and I want to plan a 3-day fly fishing trip to Montana. He is new to fly fishing but has fished the Gunpowder in Maryland with great success!! I have been to Missoula once and fished the Clark Fork, Bitteroot, West Branch of the Blackfoot and Rock Creek! It was awesome but I'd like to try a new area this time around. Any suggestions on location, variety of streams, fly shops and guides?
I appreciate it!!
Thanks!!
Paul