I am trying to decide between these two Compact Flash cards to use in my Canon Digital Rebel XT: http://www.newegg.com/Product/Produ...ice=&MaxPrice=&SubCategory=68&Submit=Property The lower priced model is 80X speed, but the higher priced model is 45X. That's the only thing holding me off... why is the higher speed model priced lower and the lower speed model priced higher? Is this bad on NewEgg's part? Do you suggest I go with the 80X model? It seems logical to do so... also does anyone know the average file size of an 8-megapixel image? Thanks in advance!