What do you want to hunt primarily? I ask because for a caribou hunt many of the rivers accessible from Dillingham are also accessible via bush plane direct from Anchorage.
You'd need to crunch the numbers to see which is more economical. If you're serious about Dillingham or Kotzebue, consider shipping your gear bulk freight to your transporter well in advance, it may save you on airfare.
You can contact the AK Dept of Labor's Licensing Division to find out how long any guide, outfitter or transporter has been in business and to see if they've had any complaints registered.
I shouldve asked as to your rafting knowlege before offering so much info. As far as water size, I agree but assume they know the rivers well enough to drop you off on one with sufficient flows to float a loaded raft.
I have a 16 foot Aire Jagurundi cataraft that will run pretty skinny water.
You may want to pick up a copy of The Alaska Rivers Guide by Karen Jettmar, A Complete Guide to Floathunting Alaska by Larry Bartlett, and Bowhunting Alaska's Wild Rivers by Jay Massey.
Larry Bartlett is a hunt planner. His website is
www.pristineventures.com and he's very knowledgeable about many of the huntable river systems in Alaska and pretty generous with his info.