I think a Dagger Outlaw is an awesome beginner boat. It has good volume and length, which makes it stable and easy to roll and really good going down river. But it also has a bit of shape to it so it'll stern squirt (the first play move most people learn) with the best of them, do huge enders (courtesy of the volume), surf, and cartwheel.
It's no surprise that I just happen to have one for sale and would love to get rid of it. Cheap, CHeap, cheap. (303) 809-0483.
Having said that, I wouldn't receomend it if I didn't have a great learning experience in it myself. The first time I endered it I knew that paddling was the sport for me. And the squirts came soon after.
Other possible beginner boats that'll get you down the river and let you play: wavesport EZ, dagger showdown, Liquid Logic Lil' Joe.
Have fun paddling.