You really should try the kayak out before you buy it. A good shop will have demos. Or try and find people in your area and test ride their kayaks. You would not buy a motorcycle or bicycle or vehicle without a test ride, and IMO you should not buy a kayak without one either.
I would avoid the castaway and the emotion. The heritage redfish/angler is much better boat. As is the Perception Pescador (old Wilderness System Tarpon hull). Also I would look at old town discovery 119 (also sold at Dicks sporting goods as Kaynoe).