What is the best flash card to use with a DSi

Hi,
Just wondering what is the best flash card to use with a DSi...With so many out there - it's hard to find the right one....At the moment I have the R4i but I'm not sure if this is the best one to use.....Anyone any comments/suggestions....... ???

iEDGE, SuperCard DSONEi SDHC, and aceKard 2i.

Acekard 2i/ Supercard DSOnei