BJ, BJ, BJ, the size of the boat is not relevant until you're on BIG water. I've seen 1970's Rangers that were only 17' with a 115 in a FLW tourney OPEN on Champlain! You fish with whats available to you. If you're on fish and your rig can get you there, that's all that matters.
There are quite a few 18 rigs in Everstarts. Mine is only 18'10".