There are a few key points about boating in Idaho to be aware of.
First, it's one of the most sparsely populated states in the union, especially where you will be working. That means boating partners are hard to come by in the backcountry unless you brought them.
Second, when you look at a map of Idaho you'll see a lot of creeks; that doesn't mean that they are runnable. Remoteness, wood, finding people to paddle with, and the difficulty of putting on with proper flow all combine to limit the creeking options here. Some insist on poking around for new runs, but consider the fact that Idaho has seen 30 years of high end paddlers and none of them have uncovered a truly classic steep creek (except the stuff in the Northern Panhandle). But, the rivers are so good that not many people care.
Third, the Payettes are pretty much the only rivers that get run after work. The stuff around Warm Lake is too remote and too long to be doable after work. That said, there is a brand new whitewater park in Cascade that should provide an after work fix for you.
My advice is to check out the classics in your area, especially the EFSF outside of Yellowpine. If that doesn't blow your hair back then look into Upper Johnson Creek.
"A river is more than an amenity, it is a treasure."
-Oliver Wendell Holmes writing for the majority in New Jersey v. New York