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.
You might want to mention that the guy is 6'-6" and weighs in at around 250lbs. 20 footers are not single handers in anything over 8 knots, if then.
