I am partial but I like RDU. Has an admirals club, enough flights to get where I need to easily enough for a non-hub, and still small enough that I can usually get from home (20-25 minute drive) to the gate in 40 minutes.

Bonus is that a lot of my travel is overseas so I frequently am on the RDU-LHR flight where I am pretty much always able to use an SWU or mileage upgrade, if not already flying paid J.