Since you're in Grand Haven, how many months out of the year do you plan on flying? Gets pretty cold on the beach in January. I'd say buy the next thing that extends your wind range the most for the conditions that you can tolerate. You know when the cold returns in the fall that those large cold weather systems offer much regular wind, but higher MPH. You can alter the wind range some with lighter frames and adjusting your leader positions, but you can maximize the wind range the most by stepping over the MID and trying to fill back with a FULL vent, BUT if you don't plan on taking advantage of the higher winds in colder weather, maybe you'd be better off with a mid vent. Go back and look at your weather almanac for the last year and get an average of the winds while paying attention to the gusts. Gusts suck and break things if you're not careful.