which one has better performance with Supercard DS One? The Japanese Kingston 2gb? Or the A-Data Class 6 4gb? How about the Transcend 4gb? i have been using 2gb cards for a while now and the storage space doesn't really bother me. but the 4gb sdhc cards are getting cheaper and cheaper now, so i want to know if they actually give me better performance overall. i read some threads where 4gb sdhc cards were giving people trouble when formatting with windows xp, etc. do those incidents occur quite often? anything i can do to avoid that type of situations? also which sdhc reader is recommended?