Sandisk Extreme 45mbps
Sandisk Extreme Plus 80 mbps (80 read, 60 write like hazril said)
Sandisk Extreme Pro UHS-i 95 mbps

as long as you arent crazy about bursting non stop 8-11fps for 5 sec, the extreme plus is best bang for buck now.

mastering: if u set write to both card, yes, the bottleneck will be the slow card. but u always have a buffer, so even during writing, there is always enough buffer for a few more shots (not burst thou)

reply via phone, so text a bit messy