I'm trying to figure out if I need to shell out for 64g model RT. The specs I have found online for Surface RT and Pro are vague at best. I have tried to educate myself on SD formats and I'm even more confused now. I know there is a difference between SD, SDHC and SDXC as far as storage capacity and format, but does the card reader and/or software for Surface RT limit sd card size? I assume that PRO version will read micro SDXC of 64g but will RT only read micro SD and 32g. My phones will support 32g but that's the limit, at least according to specs. If I don't understand the SD formats I apologize, but does anybody know or are we all waiting on more info?