M_Boats: One reef or two reefs

I am thinking about ordering a new main sail from EP for my M-17, and I was wondering if I should go with one set of reef points or two. The difference is about $90 (the total cost is about $700). I plan on sailing often on bigger water (Lake Superior, Lake Michigan), so I thought the ability to reef more would be useful. On the other hand the smallest foresail I have is a 100% jib, so maybe getting a smaller one should be my first priority... Opinions? Thanks, Andrei.