I am a novice when it comes to digital photography and have just purchased a Canon Powershot A80. I am now looking to purchase a 256mb comp act flash card but am amazed at the variation in price. Does the price reflect the quality in a card e.g. as in types of 35mm.film or is there some other factor which I must consider before purchase. I notice some cards say '4x' or '12x'. Can someone explain this to me also. Very many thanks.