Thanks for the responses. As far as living close to either DCA or IAD, it'd definitely be IAD... a place close to the Metro in DC is a must, in my opinion. My home airport in Florida is Tampa, but once I'm up in DC, I doubt I'll be flying home a lot. I'll be flying all over the country, with no real rhyme or reason. I know that IAD has more transcon flights, but I like the convenience factor of DCA.

What would be your choice based on upgrade availabilities/options? Any other perks/negatives that I should know about?