Any Slot 1 based card should be fine with the DS Fattie. I use an R4 and havent had any problems with it (doesn't support SDHC though). Dont get an expansion pack as it wont fit in the DS-Fat, but all the slot 1 cards should just work fine.
CycloDS is another good one, a lot of people use the DSTT card and are happy with it. Hey even Ozchips might be able to help you out
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