what games on the system do you consider must haves as well as what games tend to be rare or hard to find? ive been looking around for cube games since the systems went to the next gen and have gotten most of the games i wanted but every so often i wonder if im not missing something out there. like is luigi's mansion worth owning or how about animal crossing? are the harder to find games like the zelda collectors edition or the oot/Ura zelda , star wars jedi outcast 2 or mario tennis worth plunking down 40 or more bucks to own?