Exactly what I've been thinking, thanks @Spiral Bee !I surf New England year round and have a bit of a wetsuit quiver : 5 mil hooded , 4 mil hooded , 3 mil, detachable hood for the 3 mil, and 2 mil shortsleeved. I also have thermal top and shorts to supplement any of the above.
That said, I honestly think I would be fine with just the 5, the 3, and the detachable hood. Plus a pair of winter mittens and booties. This spring I went straight from the 5 to the 3. The 4 and the 2 are nice to have, but feel a bit like first world indulgences tbh.