In terms of full on thrill I would place a skiff then a cat then a sports boat..

The skiff seems faster.. BUT its another level of energy and skill to keep her upright.. The cat with kite is almost as much fun but a whole lot easier to keep upright.. and the sports boat is for beer sailing!! <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" /> Then Im old and grumpy!! <img src="http://www.catsailor.com/forums/images/graemlins/smirk.gif" alt="" />