In what orden I should get this games?

I'm not exactly sure of the release date for Animal Crossing 3DS and Mario Party 9. So I can't say for those yet.

I would say... Super Mario 3DS, Mario Kart 3DS, Animal Crossing 3DS, and then Mario Party 9 in that order. We know the first two are supposed to be out around Christmas, but the other two, not sure.