Good cab to call in upper NW?

I'm goin to Legg Mason tonight and don't want to wait 2 hours for a shuttle bus after the last match. What's a good cab company to call for upper NW?
Thanks…
Diamond cab are located in Dupont somewhere, and are always quick.
it's not really that far to walk from there to the metro. i can proudly say i've never taken a cab on my own in my entire life.

or, like chimbley, you could ride your bike.