I love cooking Pad Thai, and always use the dried kind that come in an air-filled brick shape.
I've wondered if good Thai restaurants use the died stuff too... if they're working w/ fresh soft noodles... if there's a world of difference between the two... and where you can buy fresh rich noodle in our area.
Soft rice noodles can be found in a vacuum-sealed bag at H-Mart, but I doubt that's what restaurants opt for. Are they using the dried stuff? Is there an old man in an unmarked basement in Eden Center making the D.C. area's fresh rice noodle supply? Here's a map of D.C. area asian groceries if you know of a specific spot the carries the fresh stuff.