The Dagger Kingpin should fit the characteristics you seek in a boat -- short playboat with high volume concentrated around the cockpit for looping, and yet it's widely regarded as one of the best playboats for river running. Stable and forgiving, surprisingly so
I like my playful, maneuverable Kingpin 6.3 (I'm 5'11"/175) so much for river running that I'm selling my Diesel 65 that I started out with last year, since I don't creek and rarely go out in truly big water. For river running capability (and also loops? I have no experience there), I'd lean toward a slightly big Kingpin as opposed to a smallish one, as there's 3 sizes.
Also: You could get a Kingpin for cheaper/used (avoid the Icon version) and think of what you could use the extra $200-500 for!