Whatever you go with, I would go with something that was released in the past 5 years, MAYBE the past 10 years.
Think of a kayak's evolution as being just like that of surfboards, skis, etc. Do not pay very much for an old design. The only market for them is for beginners and schools. A used kayak of an old design is worthless, really. It is a giant piece of plastic taking up space in someone's garage and if they try to get more than $50 out of it then they are not being fair.
You mentioned a Pyrahna InAZone.... great boat to learn in but outdated and you shouldn't pay very much for one. I have a InAZone 232 that I have been half-heartedly trying to sell at swaps for several years... can't get $50 for it. This year I am going to see if I can get store credit for a T-shirt for it.