Lego Potter is a rental for sure, although I would probably go with the XBox version. Multiplatform Wii games are almost always worse than their counterparts. I do like the variety in the GH DLC, and I also like Mario Tennis being on the VC.
"Put on your helmets, we'll be reaching speeds of 3!" "It was nice of you to give that dead woman another chance." "All right, look alive everybody...oh sorry Susan."- MST3K: Space Mutiny Click Here (myspace.com)
I've gotten the impression that the WiiWare Wario games are identical, but I don't know for sure. It's enough to stop me from paying for it until I find out, since I just bought DIY (which BTW is AWESOME).