I'm trying to decide between a 512 xd (H) or a 1gig for a sp350- I know everyone will say 1gig, but does the SIZE of the card make a difference in the speed? I know when I had my old stylus 300 and used a 512 it was A LOT slower than with a 128, but I dont remember if they were the same type ( I think this was pre-M).