The X-factor and Stealth 14 are built on the same hull design. My guess is that they would paddle fairly similar to each other. If you really want a boat you can stand on, those two would be great choices, along with the Hobie PA- but the PA puts you into a whole new price zone. My vote is to save you pennies and just go straight for the PA, because you will end up in one anyways
Most of the saltwater guys I know, fish while seated. Maybe the ability to stand is overrated? None of the boats you are considering are speed demons.
OEX will probably be able to rent you a boat for a day or 2, where you can take it out to an area that you will likely fish. That will probably be helpful for you to choose what your priorities are in choosing a kayak. If you are going to paddle to the kelp beds often, your priorities might change from having a super stable boat, to a boat that paddles faster. Luckily, the boats you have it narrowed down to, paddle decent for being big boats. In regard to busting out the silicone on a new boat, I always do it- just to seal up various rivets and holes that the factory may have missed.
Good luck in whatever you choose