I use American Express for 99% of my purchases (I rarely find a place that doesn't accept Amex in northern NJ or NYC). If you don't want to pay membership fees, you could always apply for an Amex credit card (the charge card requires that you pay in full each month and a membership fee).
However, if you will take advantage of the features, the fee is well worth it. I have used the concierge and travel services to get last minute hotel rooms (with upgrades) and tickets to "sold out" shows.
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2008 BMW 535i Space Gray, Black Leather, Dark Bamboo Trim| Sport Automatic with Paddles | Sport Package
2008 BMW M5 (gone, but not forgotten) Space Gray, Silverstone Merino Leather, Madeira Walnut Wood Trim | 7speed SMG | All options
Mods: Corsa Exhaust | RPI Ram Air Intake | H&R Sport Springs | Rogue Engineering 12mm spacers
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