If all you want is playing nds games or homebrew,then choose r4i gold 3ds,this is the best r4 card as well as most famous flash kit in the market,if you want play 3ds games, check your N3DS firmware whether stayed on V4.1-4.5 and the best 3ds game card was gateway 3ds, got my gateway 3ds from modchipfactory.com, I've been using them for half a year and I haven't had a single issue.if the gateway 3ds lands outside of your price range,then you can buy mt-card ,this card has similar function with gateway,but price is cheaper than it.