Best/Fastest 512MB Compact Flash Card

Hello all.

I just got a Canon A95 digital camera. I'm very happy with it thus far, but would like to upgrade to a larger Compact Flash card. I'm thinking about going to a 512MB CF card, and wanted to know if there are better/faster ones than others. I have a qucik PC and USB2.0, and also don't want a card that will slow my A95 down when taking large back to back pictures. Any recommendations on a CF card model that is fast would be appreciated, thanks much.