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Is 1080p the highest resolution you should need for now for tv? Is it worth the extra $1000 for the higher res? I know CBS and NBC use 1080i signals. Is that much better than 720p that ABC Fox uses?
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Somewhere in my research I had read that 1080p would become a broadcast standard in the future, don't know if that's true. So far, I've not noticed enough difference between any of them to tell which stations are 720p or 1080i, so I'm calling it a tie.
On the DVD players, I think composite is require for progrssive scan (or HDMI).
I bought an "up-convert" DVD play with the new TV (61" DLP 1080P Samsung) and it really works well with the "1080i" mode being the best picture by far on my set. Not really sure how it works since standard DVD are recorded 480P as I've come to understand; but it does work very well. I guess it's like photoshop for your movies.
On using a widescreen as a PC monitor, I don't think any but the newest graphics adaptors have the 16:9 ratios built in as resolution options, most still using 4:3 ratios. Widescreen PC monitors are popping up all over these day, so I'm guessing the cards are on the market as well.