It only costs two feats to get a flight speed. Dragon Wings gives you the wings, and Improved Dragon Wings gives you the flight speed. It's only three feats if you spend a feat to get the Dragonblood subtype in the first place. A silverbrow human gets the bonus feat to begin with, and starts out with the Dragonblood subtype for free.
Dragonborn comes with some serious baggage that I just don't want to deal with... ever, really.