Technically both 1920x1080 and 1280x720 is HD. But I will agree with Just Me, 1440x1080 isn't a default HD resolution.
Just for reference, 1080i is what CBS, NBC, PBS & DiscoveryHD Theater broadcast in. 720p includes ABC, Fox & ESPNHD.
However I'm guessing 99.9% of people couldn't tell a difference between 720p, 1080i or 1080p. So honestly, as long as it's 720p or above, I don't really think it matters.
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