Since it's a standard sized unit, you can use anything.
Email or call Kenwood to see what current models work with the transom remote you have. That way you can keep the existing remote, or just leave the cable and add new remote and new head unit.
sounds like an idea..... i spent 2 hours at Best Buy with some kid that had no idea....he must be from computors....lol I think I need a new remote anyway.