Keep your eye on ebay as well. I've seen some real gems pop up there.
Two other sites to watch are
www.projectboats.net and
www.usauctions.com. Currently they both have '20 I/O powered Seafaris listed that should go for well within your price range.
Good luck with your project! Remember to give us lots of pics! [img]/images/graemlins/smile.gif[/img]