SD card speeds

[Guest Lammypie]

I've just ordered my M600 from orange.

I'm looking at what SD card to buy for it.

My favorite memory manufacturer is selling 1GB card which does 6MB/S (40x) transfer rate.

The sandisk standard SDcard (sold by modaco) just says fast not what transfer rate.

Sandisk Extreme III - SD cards offer Min 20MB/second sequential read and write

Does anybody know what transfer speeds the M600 supports, and therefore what card I should get?

Cheers