I have a 5500, so your mileage may vary. . .
That said, I have had good luck with Lexar, PNY, and some other SD cards. In fact the only SD cards that have ever crapped out were the SanDisk cards. From what I have read here, nearly everyone's experience has been similiar. STAY AWAY FROM SANDISK SD CARDS!! I personally prefer Lexar.
Good Luck and welcome to the Zaurus family.