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1080P, don't go lower than 40", at least 2 HDMI/Component/Composite.
Sony, Samsung, LG, Philips. In that order in my opinion, but definitely the first 2.
120hz if you can find/afford it, but 60hz is still decent.
See the TV in action, side by side if possible, and ask if they're color calibrated, it makes a difference.
Don't fall for dynamic contrast ratios, its a marketing gimmick.
That's my concise advice.