Mini SD Memory Cards... Looking to get a Mini SD card for my Q. I know that the 2GB size is the most popular...probably more than I need. I'm wondering which is best. A mini SD 2GB card with 60X or one with 150X ? Does that refer to transfer speed? Would I notice any difference between 60 and 150? I found this site with a good price 2GB Mini SD Any help with deciding would be appreciated. Just looking to store some files and pics.