A guy near me sails an inter 20 alone from time to time, and he likes it but when the wind starts to pick up he doesn't sail it because it is to overpowered to sail alone, so he either has to find crew or head to shore.

I would say look in the 18 range.

Once you go cat you never go back! Nacra 5.2 (Elsies)#1499, running an inter17 spin!