The general consensus seems to be the r4i gold 3ds cart. because it supported by the wood official team and works great on the newest 3DS/DSi system firmware. I bought mine from http://www.r4flashcart.com/8-wood-r4i-gold-3ds-flashcart-for-3ds-xl-3ds-dsi-and-ds-lite.html, really quick shipping if you're in the U.S.