You would be surprised what a drift boat can do. On Youtube look up the videos from the Lochsa River. There are a bunch of roadside videos from Lochsa Falls(?) showing raft after raft being overturned on a huge standing wave. A couple drift boats go through the same spot and punch through with ease. I've personally taken them through some hairy spots a lot of guys would avoid, including a 4' drop over a diversion dam. Like Jerry said, its all about your personal comfort level and what you like to row. Try different crafts out on the waters you like to fish and figure out what works best for you.