The Inter 18 is a great boat, mines in my back garden at the minute. They are fully F18 legal. They're well equipped and well built, but it is worth to check the bottom before you buy one as they can get quite messed up on inters. The only weak spot on them is down wind in waves where waves hit the front beam and dolphin striker.

The hawk is alright boat aswell but from what i gather it lacks a bit of bouancy in the bow.