What affordable "type" is best for longterm cruising?
One of the most inspiring books ever written (to me, anyway) was Lyn and Larry Pardey''s book, "Cruising on Serrafyn". Written probably around 1970 and recently re-released. They sailed on a very small boat that Larry made himself. No head, limited accomodations, but very seaworthy. Their motto was "Go small, go now". That book was written with great joy by Lyn. If you have any interest, read this book. Also, Annie Hill (from England) has written a book on cruising on a limited income, which also discusses some of the compromises that you can and must make. ANY boat less than 100'' is some version of camping. And "its always better on the boat...".
My advice is to maintain and feed the dream, read, research, and know it is possible.