N64 is my childhood, essentially.
but yeah, there are some real rare games for the system, as well as a few OMG R@RE games that aren't actually rare, but idiots pay out the ass for them.
example of category 1 - Clay Fighter Sculptor's cut, Turok Rage Wars (grey cart), and Stunt Racer 64.
examples of category 2 - Conker's Bad Fur Day, Mario Party 3, and Super Smash Bros.