If you look very closely at the specs of the Sharp projector from the Best Buy website link above, it says exactly what I am explaining....
Quote:
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Supports HDTV and DTV signals, including 480i, 480p, 540p, 576p, 720p, 1035i and 1080i
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Notice how they say it supports the HDTV and DTV "SIGNALS".
Further down;
Quote:
Maximum Resolution 854 x 480
Vertical Scanning Lines (Native Mode) 480
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So, it does a max resolution of 480 lines. This is the resolution of a DVD. HD signals are either 720p, 1080i or 1080p. But this projector has a MAX of 480. Thus, not HD.
So, both projectors discussed can take an HD feed (at either 720p, or 1080i) and then can downscale it to 480p and then display it. So, yes you can hook it to a HD cable box and see your HD channels, but not at a true HD resolution.
Hopefully that makes sense. You gotta be careful with this stuff, they speak very tricky. With anything, if the price is less expensive there is a reason. Look closely at the specs. This is NOT to say that it won't still look good...but I certainly wouldn't want to spend over $1k on a projector that doesn't do HD...but seems to depending upon what part of the description you are reading.