I'm also not sure which memory card to buy for my Galaxy Note. To make things more confusing I found an answer on the official Samsung website that made reference to a "class 8" memory card which I didn't think even existed:
"This model supports up to 32GB therefore we would recommend a class 8 card. As the class 10 card has only be released there may be some compatability issues."
This answer would seem to support the idea that some users might experience issues using a class 10 card in a Galaxy Note.
That still leaves me unsure as to whether I should go for a 32gb class 6 (or class 4 as a user above suggested) or risk the class 10. Any ideas?