Appreciate the review .. am getting an x50v for X'mas. Questions on the CF & SD expansion slots... ...I've seen postings that claim one has an inherently faster data transfer than the other - any truth to that? ...A lot of the newer CF & SD memory cards rate themselves at high speeds - what would be the transfer speed to/from the two slots? Are the currently available cards still slower than the unit? Wouldn't want to buy something too fast to use