...Classic mode and All star more are going to be a pain on the the highest difficulties.
Classic on 9.0 isn't so tough until Master Core. For All-Star it's just Easy, Medium, Hard so I'm not sure how the CPU levels translate into that.
One thing I'm worried about is the Wii U transfer. I am playing on a Japanese 3DS, but my Wii U is American. I wonder it it wouldn't let me do system transfer considering the NNIDs are different as are the regions. I would hope not. I plan on getting the US version anyways, but I already have so much stuff unlocked...