Read reviews for the Wavehopper (UK) by Perception as submitted by your fellow paddlers. All of the reviews are created and written by paddlers like you, so be sure to submit your own review and be part of the community!
I tried a Pyranha Speeder, but it was not very maneuverable in whitewater. I have about six whitewater kayaks and my Wavehopper is probably the only one that I will never eventually get rid of. The only down side is that they are impossible to get a hold of in the U.S., you have to buy one in Europe and then ship it to the States or find one from the early 90's.