The only one i have is mario bros 3. It costs £3 normally, but when i bought it, it was on 1/2 price.
I have the megaman legacy collection, which features all the nes megaman games, although im not sure that counts.
When i get eShop credit, i do intend to get a classic pokemon title and an oracle game.
I do want a new 3ds so i can get megaman 7, earthbound, donkey kong country etc