I bought two basic model kayaks this last summer, but they are nowhere near the type needed for white water. This was my first summer getting into it. However, ironically, this was also the first year in which I took a whitewater rafting trip (Maupin) and had a blast.
I think I'd start with something smaller and easier like the Kalama before I'd bite off something like the White Salmon.
What'd you have in mind?