27, I don't know if this is any help at all, but if there is indeed such a thing as a Whiskey 18, Nigel Foster might have had something to do with its design. I'm looking at a picture of a Whiskey 16 in the Point 65 N brochure; they don't show an 18.
I was told by a factory guy (not Point 65 N) that all of those boats are built in China. Silly me, I thought they were a product of Sweden. That is neither here nor there, but it might be something of interest to you.
I know I'm going to commit a mortal sin, but I can't help myself. If I were you and looking for a new sea kayak, I would go to nckayaks.com and take a look. These boats are built in Tacoma, Washington and are just super. I always caution people to read very carefully how the people at Novus Composites describe their boats. Their boats are specifically designed for distance cruising, not so much for such things as rock gardening. NC boats are very high-end and are sold only factory direct. This keeps the price competitive.
My other advice would be to try out as many kayaks as you can, but be aware that first impressions are not always a very telling gauge. Learn about constucion details, materials etc.