Nizzy:
Economy Tackle here in Sarasota has a good selection of yaks, but I don't know which brands they carry. Having a sleek go - fast yak is nice, but for diving I'd rather have a slow "barge". They tend to be more stable and easier to get in and out of, and if you get caught out in a blow, they are more stable paddeling even if they are slower. Secure storage room is important, especially if you ever roll it in the surf, or just boarding. I made a cargo net & mounted eyes on mine to secure gear when paddeling, but not everyone knows how to make nets. The two most important accessories you'll need for the yak are good rack that is easy to load the yak onto by yourself, and a beach wheel cart. Carrying or dragging a yak 100-200 yards across soft sand is no fun. Give me a call when ya buy and I'll break ya in on yak diving.
Mike