Mine is the Mario Kart 7 2ds.
Basically any ds I've had has had problems with the hinges (exept one, but it had other problems.), so a 2ds would probably last the longest for me.
I have the New Nintendo 3DS that came out with Happy Home Designer (the one with Isabelle's face on it). I got it second-hand though, so I don't have the other plates to switch out.
A: The one and only.... Black New Nintendo 3DS XL. Got this 3DS model on a Christmas day along with two 3DS games. Too bad I had to buy the charger for my 3DS since it doesn't come with one. Plus I had to get some screen protectors and a 3DS case. :T
This one. I had the old black 3ds when it first came out but sold it. Replaced it with this one about a year and a half ago. But I changed the faceplates from Isabells ugly face to the Happy home faceplates that it came with.