Citi has been running some hearty AA bonuses this year, offering up to 100,000 AA miles. While the 100k offer is no longer, they do have a generous 75,000 mile sign-up bonus that only requires $4,000 in spend in the first 6 months.
Highlights: Low spend threshold, no annual fee ($75-85) for the first year, flexibility of Visa or American Express
This is a great starter card for someone who wants to get into the points game. 75k AA points are substantial and can be used on one-way awards- even on partners.