Also consider what types of planes you like to fly and whether you will be upgrading to 1st. For example, AA flys S80s from LGA to ORD. Some people like S80s for coach because you can sit on the 2 seat side and have a good amount of space and not have to get up as often for people to use the RR. On the other hand, I find 1st service on S80s to be average at best. Just a thought.
Jakatz