I agree with Big Media Matt. Or, at the very least, stop holding the highway funds hostage and send the decision back to the states.
I think 19 would work reasonably well in this country - still keep it out of the (legal) hands of high school kids.
UPDATE: Just wanted to add that I do think the DUI concern is a very real one. Proposed solution: Provide a lower drinking age only for those without driver's licenses. Maybe I'm on to something here...
