For the m3 Pro SD i can get an OCZ card that is 150x but the size may annoy me For the m3 Pro Mini SD i can get a Kingston mini-sd for about the same price, but the speed is unknown, i think its approx 60x. I checked m3wiki, and i'm still unsure, maybe you tekksavvy people can help.
http://www.realhotstuff.com I just got my m3 from them last week. M3 microSD/passcard3/1 gig SanDisk micro card.......$107 Everything is working perfect also Not sure about the speed ratings on the sanDisk stick, but its pretty quick.