Something to think about. the Santana 21 has a 550 lbs. swing keel. that's great to have if you are trailering your boat a lot or sailing in some real skinny water. Not so great when a strong gust of wind hits you unexpectedly and knocks the boat over.
The Santana 22 my brother used to have has a 1200 lbs. fixed keel. That keel will greatly lower the center of gravity on the boat and make it much less susceptible to a knock over.
That's just one reason the 21 is really made to be used in protected waters, not the open sea.