I have a Hobie 18 for sale with trailer. I bought it locally and have used it over the last 5 years a bit for a trip in S. Texas and once in Sanibel. However, those are the only two uses in salt water I'm aware of. Hulls are sound with no soft spots. Sails are in good condition for their age. Tramp is also in good condition. Rudders are in need of a new blade as I had an emergency repair to a plastic blade which involved cutting off the top after not kicking up. Works fine though--just 2" shorter...Huge pile of extras, hardware, shrouds, butt buckets, you name it. I've converted the trailer into a flatbed so I can also use it as a Hobie wave trailer as well. The mast beam needs a new post and bearing. Mast is straight. Would consider parting out if you need specific items if the price is right.
Alternately, if someone can give it a good update & use the heck out of it I'd let it go for cheaper.
Pics can be seen at http://chicago.craigslist.org/wcl/boa/4133054466.html