Actualy, I think spyder9 offers some pretty sound advice here, at least for me. It seems my opportunities to offer live CD's is expanding. In some situations, I may have 5 or more recordings coming at me at once and they all need to be transfered before I do a quick post, write a cue file, and burn a master. That speed in doing the transfers would be a big help, and I'm wishing I had bought class 6 cards instead of 24 class 4's.
Additionaly, I wish I'd have been given this advice before I'd invested so heavily in full sized SD cards. Obsolescence is often part of the price we pay, but good choices can help limit those losses. Not when I start adding more decks to my line-up, I'll most likely be adding m10's. {sigh} And purchasing more SD cards because I have no microSD's.
-JT