Franchises that are now familiar to Westerners should be worth it. Fire Emblem, Mother/EarthBound, (Advance) Wars, Custom Robo... I don't know much about Sin & Punishment but the name's come up quite a few times, and if there isn't much work required to bring that over, then by all means! Mario's Super Picross and Kirby's Super Star Stacker are both ideal, too. Was Mario & Wario a Japan- and Europe-only game? North America missed out, so bring that too. (EDIT: Oops, didn't read Luigi Dude's post...)
When I went to this import store near the end of the Super NES's life, other than playing some Super Mario 64 early there, I rented games that were simple. Mmmm, Super Bomberman 3-5. Okay, they were very similar. But they don't have much text, so bring 'em all over, Hudson! I also rented games like "Kirby Super Deluxe" (but that soon became Kirby: Super Star and got localized), some DBZ fighting games, and a Sailor Moon fighting game. >_>