Yeah, you and I are among the few haha. ._. For any game that I could see myself eventually trading in eventually or a game that I don't think I'll play again after I beat the story, I've been getting those in the cartridge form. For a game like Animal Crossing, I want to have it all the time; it would be silly for me to buy the cartridge version when I'm always going to have it in anyway!
I take mine with me everywhere, too haha.
I love seeing if I can get StreetPasses anytime I go out and about.
Okay that sounds awesome! I'm going to be filling up my catalogue as well (although not extensively in the very beginning) so that will be much appreciated. I'll help you however I can, too.