[quote name='GWIZ2260']
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I wouldn't waste my time with anything less than a 1080p HD-DVD player IF and ONLY IF the HDTV is capable of supporting it. There definitely is a difference between the 2 resolutions, and actually have several units, two capable of 720p(1080i) due to that was my initial HDTV purchase, and 1 which is 1080p. The difference between the two resolutions is minor on a smaller 1080p HDTV, but is quite noticeable on a larger 1080p HDTV.[/QUOTE]
Unless you have a plasma that supports 1080i, you've never seen anything but 1080p on your 1080p display.
1080i to 1080p tv = 1080p displayed
1080p to 1080p tv = 1080p displayed
You may have a not-so-hot deinterlacer in your 1080p set, which could result in a decrease in visual clarity in whatever is displayed, but thats going to vary by model...and frankly at this point in time, you'd be silly to spend $100+ on a 1080p outputting HDDVD player if you could find a 1080i outputting one for $20 or $30 bucks, the visual payoff simply isn't there.
here, taken from a reputable HT website doing a review of HDDVD versus BD:
"The truth is this: The Toshiba HD-DVD player outputs 1080i, and the Samsung Blu-ray player outputs both 1080i and 1080p. What they fail to mention is that it makes absolutely no difference which transmission format you use—feeding 1080i or 1080p into your projector or HDTV will give you the exact same picture. Why? Both disc formats encode film material in progressive scan 1080p at 24 frames per second. It does not matter whether you output this data in 1080i or 1080p since all 1080 lines of information on the disc are fed into your video display either way. The only difference is the order in which they are transmitted. If they are fed in progressive order (1080p), the video display will process them in that order. If they are fed in interlaced format (1080i), the video display simply reassembles them into their original progressive scan order. Either way all 1080 lines per frame that are on the disc make it into the projector or TV. The fact is, if you happen to have the Samsung Blu-ray player and a video display that takes both 1080i and 1080p, you can switch the player back and forth between 1080i and 1080p output and see absolutely no difference in the picture. So this notion that the Blu-ray player is worth more money due to 1080p output is nonsense."