For the 20D, the Ultra II is about as fast as it gets. According to Galbraith's charts, a III buys you nothing except a more expensice card.
That said, one could more or less futureproof their card a bit by going with the Ultimate III, since it's a fair bet it'll run faster in the next generation cameras.
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"You miss 100% of the shots you don't take" - Wayne Gretzky
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That said, one could more or less futureproof their card a bit by going with the Ultimate III, since it's a fair bet it'll run faster in the next generation cameras.
"You miss 100% of the shots you don't take" - Wayne Gretzky