I doa fair amount of reading on a daily basis, and don't need a card at all. Are you sure you even need one before you bought 3? My 505 right now has about 70-80 novels on it, and some short-medium length stories. That's at least 6 months of reading right there. And there's still lots of free memory space left over.
Your best bet is to simply load a whole bunch of books you plan to read into internal memory. It is easily accessible and has the least battery drain. If your internal memory is full, you aren't really going to read those 'second tier' books in a card any time soon.
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