1. Super Mario 64
2. Super Mario World / Super Mario Advance 2
3. Super Mario Bros. 3 / Super Mario Advance 4
4. Super Mario Land 2: 6 Golden Coins
5. Super Mario Bros. / Super Mario Bros. Deluxe
6. New Super Mario Bros.
7. Super Mario Bros. 2 / Super Mario Advance
8. Super Mario Sunshine
9. Super Mario Land
10. New Super Mario Bros. Wii
Haven't played much of the more recent games (Galaxy, 3D Land/World, etc.) but this list rounds off nicely at 10, so I think I'll keep it that way