I am in need of a credit card that I can use for advertising costs. I am under 18 so I realize I am going to have to have a parent co-sign. Anyways, does anyone have any suggestion on which would be a good card, note that I am not spending much but I plan to in the future. I hear Amex is good, but does anyone have any other suggestion and some facts behind their suggestions? Thanks. (It would be nice to earn AA miles with it considering I have a lot to my name already.