I've played just about every wii game worth playing and alot that weren't worth playing.
You have all the games worth owning on Wii. Personally I would throw in Excite Truck and Zack & Wiki: Quest For Barbaros Treasure
If you liked Super Paper Mario, you might want the GameCube Paper Mario. I think it's called Thousand Year Door.
IF you can influence where the person who is buying you SMG is buying it from, and they haven't already bought it, I would suggest getting it from Toys R' Us. Right now they are having a deal where if you buy SMG, you get 50% off any other Wii Game of equal or lesser value, which is all of them except Guitar Hero 3. Here's a link to the ad.