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don't know if its the best but i'm using a PNY optima SD HC 16GB, i store my musics on there and any files/document on there. so far its been good, played music on itunes straight from the card with no lag.
 
Well, that it is a MBA doesn't matter for the question.

If you need speed go for something like SanDisk Extreme, otherwise drop down to Ultra or so.
 
Dropbox

Is it possible to make the SD card on the MBA your folder for Dropbox? And if so can you TrueCrypt it?

Thanks
 
As long as you are not buying a real no-name brand I would always look for the class of the SD card.

For example: Transcend SD cards are more or less half the price of SanDisk and come as well in class 10.

Honestly, as 32GB SD Card and up I would get at least class 6 or 10 (don't know if there is class 8).
 
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