jeffrey-c:I've got a Hobie that I love. The unique thing is they have a pedal arrangement that "swims" through the water - I find it really efficient and far less tiring than paddling with my arms. The Outback model can take a dive rig, and is very stable.
http://www.hobiecat.com/kayaking/models_outback.html
I've seen these at several shows but have always used "traditional?" kayaks without a problem. Do you find it as fun for just kayaking or are the advantages really in fishing/diving/having more gear?