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They're all worth getting. If you want something most similar to what you already own, and assuming that you enjoy adventure games, I'd go with Paper Mario: Sticker Star. New Super Mario Bros. 2 and Super Mario 3D Land are straightforward platformers with perfect controls and flawless platforming, but they're fairly short. Mario Kart 7 will likely last you the longest due to online play, and it is a great game as well.
Super Mario 3D Land is my second favorite game of all time (Metroid Fusion being the first), if that matters. I'm definitely in a minority, though.
"I will give you a show like you have never, ever seen before. Why?Because I can." -- Shawn Michaels
SM3DL is the most impressive. Mario Kart 7 is pretty barebones but you can get a lot of replay value out of it due to the online. Sticker Star is meh, and has next to no replay value. NSMB2 isn't bad at all and has a decent amount of content, but noticeably recycles assets from NSMBWii.