There's more options I could add I just realised. Why did you sell it?
Basically... more games.
Because it was a $250, there wasn't a game that appealed to me worth $40 + tax. So by alternate thought, I defected to a $100 PSP with a 32 GB Memory Card since PSP already has a fair share of games that can already be downloaded/hacked/played. Hatsune Miku's Project Diva 2nd already has a full 100% English Translation, and don't forget a Prinny themed platformer.
However, I'll most certainly rebuy a 3DS by March of 2012, or the year after in 2013 when Nin10do unveils a newer, better version of the 3DS. Why March? Because NDS' best months were always March and November. As of right now, A Zelda, a Mario Kart, and a Snake Eater hasn't been enough for me to hold out or keep a 3DS yet. Also the PSP I bought matches the color of my NDS.