The size of boat isn't as important as the ramp depth needed to launch. Measure from the parking lot surface up to the mud line on the boat's transom. Some ramps (Lake Abel is a prime example) have so little depth that summer droughts can force you to back dangerously far out into the lake. If the boats you're considering have you seated up on a casting deck, consider a different design. What's going to stop your fall over the side if your lose your balance?