If it is delaminated, then do not buy it. (Unless you really WANT a Sol Cat 18, and LIKE to learn how to repair these things.)
I'd recommend waiting for a solid Hobie 14 or a Hobie 16. They are out there for cheap, if you are patient. Start with a crew member, until you are confident and had experience righting a flipped boat with two people. Sailing with others is always more fun. Soloing can be more "spiritual", but take the risks in small doses as you learn to solo. I've dumped my boat soloing, but my lake allows me to float into shore, where I can walk the mast back up.-It's still embarrassing, as people come up to "rescue" you. I've got the regular lake users not to worry, if they see me flip.