Paper Mario really is a no-brainer this month, assuming you have the coins, and is probably the best CN game for Wii they have ever offered. Kirby Super Star is good too, but that is of course on the Dream Collection anyways (which is still on sale for $20 @ Best Buy until this Friday for RZ members, just another reminder in case people forget the other thread).
Thanks for posting this, I had not seen the Best Buy thread and didn't know Dream Collection was on sale. I've been waiting for a sale on that for quite a while, just picked it up for $5.24 after using a $15 RZ certificate.
I'm on the fence about Paper Mario, I haven't played any games in the series, though I did buy the Wii version when it was on sale at K-Mart a couple months back. Maybe I should open that up and see how I like it before deciding on the N64 version.