You should go out on a catamaran and see if it is for you... (my guess is you will love it)

Supercats rock! The ones i have seen and sailed all were solid and handled well. That being said... 20+ year old boats always need parts replaced and work...(so do brand new boats) so you should expect to do some work and spend some cash on parts within the first year...

The price sound good if the boat is in sailing shape.

They are pretty powerful boats and you should get some instruction.... actually the best way to tell if the boat is in good shape and you think you can handle it is to get your friend to take you out on it a few times. Even then... get some instruction, lessons, maybe even a boating safety course

You ask if parts are as available as a Hobie.... NO boat in the world has available parts like the Hobie's (esp the 16) but anything can be fixed/rebuilt/repaired...