You might think about holding off on that. I just read an in-depth preview on either Engadget or Joystiq (forget which) where they were allowed to play with final hardware for a long time. It didn't sound very good. Some of them ended up with pounding headaches from the 3D effects, and the 3D effects sound pretty bad. The viewing angle with 3D on is like 1 degree. Any movement causes it to go blurry or to destroy the 3D effect altogether, so you have to keep your arms perfectly stiff while playing. Most of the games that used 3D didn't use it for any purpose other than gimmick, too. The article concluded that most of the reviewers would end up using the device in 2D mode most of the time.
On top of that, the 3D slider thing was really wonky. The proper position varied from game to game, so a lot of time is spent trying to get the thing properly calibrated every time you start a new game. And they also mentioned how antiquated the resistive touch-screen feels when half the population has been carrying around a device with a capacitive screen for years.
And the battery life is pretty abysmal. Nintendo is claiming 3-5 hours! That probably translates to 2-4 hours in non-marketing speak.
I'd at least wait for some must-have games to be released or the price to come down, or maybe a second revision with better battery and, maybe, a better screen. A 3ds lite, so to speak.