I did a 6 day trip in 2003 down combining the Jarbidge and Bruneau. The shuttle logistics are pretty easy (they only get shitty if you try to access at indian hot springs) and I think we paid our driver $80, but we tipped heavily. We went in early june when the water was already droping (started at 1500, took out at 700). We took two 14' oar boats and 3 kayaks, but the rafts were a bit of an ordeal. It made for a great week long trip in some pretty unique canyon, and I want to go back. Doing both runs would make for a kickass self-support trip, if you can carry 5-6 days worth of food. If you know some open-canoes that can handle class IV, the extra gear storage space would pay off. Or if you can get someone to bring a small cataraft, you could even pack some beer!