Transcend TS32GSDU1 Class 10 UHS-I SDHC 32GB Premium Memory Card (300x) [Amazon Frustration-Free Packaging] (Personal Computers)
Since I already have three SD cards from Transcend, it was not a difficult decision to choose the brand for me. However far I had only the 10 class. The speed was OK, enough perfect for Full HD recordings of AVCHD itself with 28Mbps (Sony NEX VG20).