I eventually got the Washington Hilton and Towers (3* in Dupont Circle) for $78/night. Bidding history: up to $72 for Georgetown/White House/Dupont, failed. Started a new bid at $74 for 3* White House, failed. Added Georgetown, $76, failed. Added Dupont, $78, got the Hilton. I thought normally Dupont hotels were more expensive, but oh well. Still not a bad deal. The best possible price was at least $73. Cheapest I could find was $119 a night, on most travel websites. Priceline works out to $91.50/nt after taxes, so it's not that bad. I wish I could edit my original post!