I'd go with SMG2, LoZ:SS, SSBB, DKCR and Kirby:EY
M:oM sadly, has already been heavily discounted everywhere. I doubt there's any point of rereleasing this.
NSMB/Kart are still strong sellers and won't be discounted.
Other titles could be: Mario Party 8, Wii Party, Wii Music, Brain Age Academy, Endless Ocean: Blue World