unless you need the download and write to card speeds dont bother with the newest cards. we use extreme 4's 2GB and firewire download as i need the cards turned around fast. around 60 secs for 2GB raw. if those are not your parameters then go for extreme 2 or 3 and stick to 4GB or under.

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The summer is here and the time is right,
We're going racing in the street..

Canon Forever

1Dmk2,10D, 20mm,28-70mm,200mm, Elinchrom3000,1500,600's,500's, Multiblitz200,Bronica SQb, expensive Manfrotto tripod