http://www.amazon.com/gp/product/B001C9P5TO/ref=oh_details_o06_s00_i00?ie=UTF8&psc=1
32 gig, class 4. Worked like a charm off the bat and is very budget-friendly. Not sure how a faster class of card would compare, but I have been enjoying this one just fine for months now.
You can get a 32gb card for cheap now. I got a samsung evo 64gb sd card for like $35. http://www.amazon.com/Kingston-Class-Memory-SD4-32GB/dp/B001C9P5TO