If you're shopping for a new TV, Woot and Slickdeals are two good sites to keep an eye on. That said, if you see one you like, BUY IT. It isn't unusual for a desirable deal to only last hours or even minutes. You have to know what you want and be ready to buy.
As for specific models, I'm no help because I'm not terribly critical of TVs. We have a 3yo Samsung 40" 720p that we like. These days, there's no benefit of buying a 720p set with 1080p being so inexpensive, but at the time 720p was worth $200+ in savings.
Chris