Originally Posted by JA$ON

Business - Platinum, no preset limit (but its a charge card, not a credit card so full balance is due every month) BY FAR the best concierge service of any card. Ive gotten flights last minute that even the airline showed as sold out since AMEX keeps seats reserved on a lot of major cities / hubs. I had wallet stolen in SF once (ID, cards, cash...gone)....they sent a car to get me, booked me a ticket home and had a car to pick me up when I landed. And called the local police to help. You can use a police report AS ID to board a plane in cases when your ID was stolen. They coordinated it ALL!

Personal - (could be used as business though) Starwood Platinum - Best AMEX Ive ever had from a card / miles standpoint. You earn Starwood points which are amazing for use with Starwood itself, but they can also be transferred to most any airlines miles program.