Hi,
For people interesting in a 32gb card, i've receive my Sandisk Extreme 32gb 45mb/s class 10 purchased on amazon France for 32€.
I immediately benchmark it on ML, and results are very good !
Read and write speed around 40MB/s (seems to be the maximum speed for the 650d)
Max write speed : 41.3 MB/s (16384k buffer)
Max read speed : 43.5 MB/s (16384k buffer)
That's a good constructor : announce 45MB/s, and almost made it !