The benefit from a super fast card comes when your buffer is full due to fast FPS shooting, or faster downloading to your computer, assuming you have a super fast card reader to match.
Unless you are doing that, a inexpensive Sandisk 60 mb/sec CF card is overkill, but a good middle of the road choice. In another year or even this next Christmas, prices for those super high speed cards will drop as a newer and faster one arrives on the market.