NSMB came out in 05, right? And Galaxy came out in 07 I thought. Two years. Plus I am concerned with how long Galaxy is compared to the other games. Plus with Galaxy 2 on the horizon, it feels redundant to have Galaxy 1 on there...though I guess the same could be said about NSMB since the Wii one is coming sooner than Galaxy 2.
I guess SMB, SMB2, SMB3, 64 and Sunshine would be a good set.