[DS] Mario and Luigi 3: Bowser's Inside Story - 5
[Wii] Super Mario Galaxy 2 - 2
[Wii] New Super Mario Bros. Wii - 7
[DSiWare] Mario vs. Donkey Kong 3 - 0
Why I chose NSMB: Closer release date, still recovering from 2 epic single-player games I just finished (SMG1 and Phantom Hourglass), so slightly-less epic multiplayer sidescroller looks most fun.