Personally, I bought the M3 Perfect SD with Passkey2 from www.ubid.com/. While the price isn't as good as the SuperCard SD, it does have much better battery performance (doesn't take much off of an average charge on the DS, while the SC can cut the battery time by nearly half. That's not such a good thing, in my opinion).
I haven't had any problems with it running anything, really, and nearly all the games I have run just fine on it through the flashcart. It's say it's been a great purchase thus far.
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