Let me second Pete. I went on a quest the other day for a deal at the Swan/Dolphin. The best rate I found was $250, but DU has it for $144. Now the problem is I can't book today so the rooms could sell out, but.....
(Also, you are supporting these boards which is nice!)
On hotels.com be sure to check the cancellation policy. I have used them and the time I did the money was not refundable if I had to cancel which may or may not be an issue.