Zeb, a word of caution on MyMemory own brand SD cards, I put one in my 1D MkIIn and it felt like a tight fit going in. With that one insertion it wrecked the reader slot with just a matter of days to run on the warranty. The design on the slot/cards prevents you inserting the card badly so I have to chalk this up to poor manufacture. I've no idea whether it was a one-off but I'll be sticking to Sandisk in the future.
On the subject of counterfeit Sandisk cards there are some interesting images on this thread:
http://www.ukar.co.uk/cgi-bin/ukarbo...hl=counterfeit
The forgers are certainly giving people a difficult job spotting their contemptable products.