I am considering upgrading the mSD card on my D1. I am thinking about putting in a 32GB Class 6 because I am still running the original card that came with the phone. Does anyone have an opinion (yeah, I know) on whether this upgrade will make any discernible speed improvements on the phone?

The main reason I am upgrading is for more space, I have a fairly large music collection on my phone and and I am running a2sd on a 1GB partition, so things are getting tight. The price difference between a C2 and C6 is enough to make me wonder if there really is any sort of performance difference.