The bride and groom will be spending the wedding night in the Ritz Carlton. This is one of the five-star hotels that the DC area is known for. Rates go from as low as $170 up through the stratosphere (a few thousand dollars per night). If you can afford the minimum rate, this is the recommended place to stay, as it is attached to the same building that the reception is being held in: in other words, you can get pissed drunk and walk through the Tyson's Galleria to get to your accommodations.
The remainder of the listed hotels are in price decending order. Each is within .1 - 1.5 miles of the reception facility. So, a cheap cab ride is all it takes to get there. Each also has easy access to the Capital Beltway and therefore easy access to the wedding ceremony site, should you wish to stay there the night prior to the ceremonies.
Reasonable rates for each are available through sites like Hotels.Com, Orbitz, etc.
