My biggest non-purchase regret was when a friend going off to college offered to sell me his SNES and ~150 games for $150 (about 50 games were Japanese superfamicom carts, including all the DBZ, DQ, and FF RPGs).
I have my old NES, and my wife has her old Sega Genesis, and we spend almost as much time playing those as our newer games.
I have my old NES, and my wife has her old Sega Genesis, and we spend almost as much time playing those as our newer games.