May not help the OP, who wasn't interested in AA miles, but if they work for you Citibank offers a few versions of MC with sign-up bonuses in the 10,000+ mile range and no fee for the first 6 to 12 months - so you can cancel it after you get the Hyatt bonus. More in the AA forums. One of the threads is here:
http://www.flyertalk.com/forum/showthread.php?t=325872