i don't think there is a 'best', but there are many that do the same thing. I use the dsone which info can be found on here http://eng.supercard.cn/manual/dsone/ and a list of dealers here http://eng.supercard.cn/dealer.htm . There are many other cards that accomplish the same thing such as the CycloDS and the newer r4. They all do the same thing. The biggest difference in some cards in that memory is built in and not in stick form.
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