Surprise, surprise, my goal has always been to have a complete collection of Mega Man games. However, my definition of complete is more "Every game" and less "Every game variant complete in box." So, to me, having both version of Mega Man Battle Network 3 is more important than having all 3 variant box covers for Mega Man 3. In that regard, I'm almost there. I'm only missing a handful of games, and I have included certain Rockman games too, like Super Adventure Rockman, or reproduction games, such as Mega Man and Bass for the SNES.
Aside from that, there are certain series where I'd like to have all or most of, such as Legend of Zelda or Kirby, but they're not my goal. For instance, I have the Legend of Zelda Collector's Edition Gamecube disk, which brings LoZ 1 and 2, so I don't need to find an NES copy, or GBA copy for that matter. It's not that important to me. Plus, it saves me having to get a N64, as it brings OoT and MM. In terms of consoles, there's only one console left I want to purchase, and that's the Colecovision. It's the first console I ever had, but was tossed away. I had 3 games for it: Donkey Kong, Donkey Kong Jr., and a third game. It's my goal to one day own a working Colecovision and those games I once had. Just those. I have no real interest in any other Colecovision games. I only want it as a way to "restore" my collection by having every console I ever owned once again.