I'm rather curious what individuals on here are using as the source of memory storage in their cameras. Not the card type, but rather the size (1GB, 2GB, 4GB...) I'm currently at odds between getting a 2GB card of a 4 GB card for a Nikon D40x, with 18-55mm lens. I realize there is a different in price, but would it be better to buy two 2GB cards for near the price of the 4GB? Recommendations? I'm looking to purchase them from www.costco.ca. Thanks.