Sandisk or A-data sd cards are the best.
Class 6 is hellofalot faster then class 2, i only have a class for now since i lost my 8gb.But you should get either one of those maybe transend if its cheaper.
Active:LG Nexus 4_Vanir Official, NEO kernel v9
Kindle Fire 1G_CM10.2
Owned: G1(Backup)-> Mytouch3GS(Sold) -> SideKick4G(Traded) -> MyTouch4G(Sold) -> Sensation 4G(Sold) -> Galaxy Player 5"(Sold)