When it comes to which is better, it really comes down to what are you looking for and what are your tastes.
With the higher resolution you will always have a crisper look, more vivid colors etc...
What you will get with the lower 720p screen resolution will be a softer look.
Both look great, but the 720p simply won't be as detailed.
If you are a gamer, the new PS3 coming out is boasting of supporting 1080p.
Also, if you get the 1080p, you can always scale it down to the 720p if you like the softer look.
Just some thoughts.
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I am ready to buy a TV and am looking at the Samsung 5667...
Wondering how much of a "real" difference a 1080p will be when it is out and if the difference of 720p vs 1080p and the extra cost of the 1080p set is worth me waiting.
Like everything once something is released a new techology comes online...
My attitude is why wait and get this one now (the reviews seem really good), but wodneirng what other opinions are.