Sell me on the 3DS with current/upcoming list.
Also with Nintendo's approach to the WiiU at the moment, I'm finding it hard to commit to Nintendo as opposed to Sony. (Not a fanboy of either btw)
Luigi's Mansion Dark Moon.
Fantastic adventure/puzzle game, sort of similar to an old point and click, lots of personality, very fun, fun multiplayer.
Kid Icarus Uprising
Take Diablo, Star Fox and Anarchy Reigns, add hysterically funny characters and a decent plot, add AMAZING multiplayer and boom. Control schemes a bit awkward but wasn't too bad for me personally.
Super Mario 3D Land
The best blend of 3d and 2d sidescrolling ever, this is one of my favorite Mario games. Lots of content, best use of 3d (aside from maybe Kid Icarus's flying sections.
Mario Kart 7
Great addition to the Mario Kart franchise, lots of fun with great multiplayer. Not that different from previous entries but still worth a purchase.
Fire Emblem Awakening
Fantastic game, great characters, really challenging SRPG, but very fair. Good for newcomers to SRPG's (like myself) with an excellent learning curve, and tons of content, especially dlc, both free and paid.
Harmonight
Amazing rythm game, really fun, good difficulty curve, great original songs and a great world an character design.