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SanDisk Ultra 64GB UHI-I/Class 10 Micro SDXC Memory Card Up to 48MB/s With Adapter- SDSDQUAN-064G-G4A [Newest Version]
SanDisk Ultra 64GB Class 10 Micro SDXC Memory Card, Frustration-Free Packaging [Old Version]
Get the Sandisk Extreme Pro (faster than Sandisk ultra). This is U3 and has faster sequential read/writes. $34.99
Read / write speed (mbps) : 80-90 / 60-70.
For use in phone / tablet:
Get Samsung Evo : Has faster random read/writes (which is more important than sequential) $24.49