I'm a priceline junkie and I love getting rates on great hotels from coast to coast.
The Omni is easily the best on Priceline for Pittsburgh. The rooms are huge. The lobby is stunning. Even the bar downstairs has some great food. Downtown Pittsburgh is a ghosttown after dark, so the cheap parking at the garage next door is a definate "must" for those on a budget, because you'll be driving to get to anything worth going to.
Robes in the closet are good enough to take home, but the star of the show is the monster bed that I would happily spend the rest of my life in.