Thanks Filark. I read that thread, but even there is seems everyone is wondering about the efficacy of speed/class. I don't even know what class I can exploit on my PC if I DID want to pull the micro-SD and mass-load MP3 files (which I don't).

Ideally, I'd like to get the most out of my PE while NOT flushing money down the rat hole by buying what it cannot use.

There's also the consideration of technology advance. A 32GB micro-SD TODAY probably costs what a 16GB did six months ago, and will cost what 16GB does now, six months in the future. Doing a Google search, I see this same dilemma being played out all over the place. NO ONE KNOWS WHAT "CLASS" MEANS, AND IF IT MAKES A DIFFERENCE.
http://www.sdcard.org/developers/tech/speed_class/
... so they're USELESS
On another site, i found this:
Class 2 = 2 megabytes/second
Class 4 = 4 megabytes/second
Class 6 = 6 megabytes/second (why couldn't the stupid ASSOCIATION provide this!?)
(write speed to an empty card)http://www.berryreview.com/2009/01/1...e-read-speeds/
If this is true, I'm assuming a "Class 10" card can accept writes at 10MBps. Now if we knew the limitations of the Entourage bus the micro-SD plugs into, we'd be in business.
Of course, if most data transfer is going to happen using a wireless network, or worse, wireless tethered to 3G, a "class 6" card is overkill, but perhaps not for read speed. Online I see Class 10 32GB micro-SD for about $75, or HALF what I paid for the PE itself. I see 16GB Class 10 for $26.