Oops, it's GSO not GBO (Greensboro,NC). AA serves DFW but I'd almost rather connect at IAH than fly direct MOB to DFW on AA. They really made me mad this past year on a number of occasions. Since I go to CA 3 times this year and will most likely fly CO on those, I figure I'd stick mostly with CO overall.

Also, like you mentioned, a big disadvantage is flying the ERJs to most of my destinations--no first class, not much incentive to be an elite.