For 32GB cards, I have used the said Class 2 from Sandisk. I recently upgraded to a Class 10 from Lexar. Both are reliable.

As many others have observed, Sandisk is very conservative and by the book about their card classifications--the class 2 actually performs more like a class 4 in terms of write speed. If you can get a deep discount on the price, it's a great value...

The Lexar write speeds are as advertised. No problems with it so far...