I will add that the whirlpools, and amount of huge holes and crashing waves on the Futa are hard to find in the states... The hardest parts of the Futa are: Inferno Canyon, The Terminator Section, and Bridge to Bridge. Most people don't run Inferno until below 12,000cfs... I think. Terminator Section is easiest, other than Terminator Rapid, but there is still Asleep at the Wheel, Kieber Pass, and Himalaya. Bridge to Bridge is action packed, and there are plenty of hazards to watch out for. It's the most commonly run section, but is not easy either.
That being said, sections of the Snake River in WY, the Payette, other runs at flood stage, and big water runs in Canada could be compaired to the Futa. It's big, but is also one of the coolest, most beautiful places I've been lucky enough to paddle. Enjoy!