Southwest has the most flights out of our airport, and I love the SW credit card. It's really great for racking up the freebie trips. If you have a good flight schedule out of your airport on Southwest and can fly them lots of places, this would be a great card!
For a points examples:
A one way flight from St. Louis to Newark costs about $120 or about 7,000 points.
A one way flight from St. Louis to Orlando costs about $160 and is about 9,600 points.
Just double these for roundtrip fares and points.