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1080i resolution is about all you need. As said, the more expensive ones are probably 1080p and then some will be more expensive just because of the brand name. Also figure in that when they are on display in the store they are probably playing a DVD, maybe even an HD DVD, and use expensive high end cables. That is why you see less difference in the picture at the store but when you get it home you may see a marked difference in picture quality unless you run the same setup.
I'd also recommend making sure it has at least 2 HDMI inputs.
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