I might have to go for the 15/18 option as I really want a Y class and the 9.8 will struggle a little. Would be fun on the Zodiac 340 in the meantime too.
I would be loath to sell the 9.8 and might hand onto it anyway (even if I find a 15/18), as we all know they aren't going to go down in value anytime in the near future...