I need new cards I normally use scan disk II and III I just got the new 5D Mk II and was wondering in case I do shoot video. what cards should I use for it?
Sandisk Extreme III, the ones you've been using, should work just fine.
There are rumors that if you use slow cards you might get jittery video. I haven't experienced that with my 7D.
Besides, you already own the cards, why ask us and not try for your own?