I always assumed most collectors, at least initially, collected things rooted in their childhood. Had I not played Atari as a kid, I'm not sure I would see the appeal in collecting it. Once I got rolling along with a museum-like gameroom I branched out into systems I had never played in their prime, but that was more of hardcore collecting instinct than anything else. Right now I can't see collecting any cartridge based system unless you feel like paying high prices, not much stuff shows up in the wild anymore. I'd say go for something with super nerd appeal like the Vectrex.