[quote name='VileEighty']Roger that, edison. If you happen upon a card you like, let me know, would you? I'd like to upgrade from the 4gb that came with my XL... 32gb sd cards are pretty damn cheap (especially in comparison to a Vita's 32gb...) and it seems like a very long-term, worthwhile investment.[/QUOTE]
I had purchased a SanDisk Ultra for my XL after reading about SD card upgrades for the 3DS. While the transfer from the included 4GB card went well I soon started having problems. The 3DS XL would randomly display "The SD card has been removed" message, when returning to the HOME screen icons would be missing for items on the card, or games that used the SD card would complain that the card was not usable.
I finally gave up the other night when you were sending the stationary. Swapnote would download the messages, but then error out saying something like "The messages could not be saved, restart the application" so I went back to the original 4GB.
I picked up a Lexar 32GB card yesterday at Office Depot ($19.99 on sale) and haven't had any problems at all. I also feel better as it's the same brand as the 4GB one that came with my XL.