I’ve been using American Express for many years now. Their rewards program is one of the best – you can redeem your rewards points for many items, including Dell certificates. I have used these certificates to save a lot of money on purchasing new computers and accessories over the years. I recently redeemed my points for a $100 gift certificate to use on a Radeon X1550 video card. Unfortunately, after spending two entire days trying to get the card to work, I didn’t have much luck.