The link you provided didn't work. Is this it?
http://nh.craigslist.org/boa/2502016602.html
How often do you sail now? Do you use both of the boats that you currently own?
She looks very similar to the Cal 21 we used to own. One of the biggest reasons why we sold her was the mast. It is heavy and not easy to put it in in the spring and take it out in the fall. Keep in mind, two strong young men were performing this task. Will you have help with the mast? Will it stay on the lift all year with a bubbler?
Our Cal 21 was super fun, very stable, much better in my opinion than the one we have now. I think it is a 15' or so, Bombardier, which is similar to a Laser. I think you would enjoy the bigger boat very much.
Good luck and keep us posted on what you decide to do.
Happy sailing!
