Video/Sound delay with AppleTV on higher resolutions

I have a new Sony 55" RP SXRD HD TV (1080p max res), and just hooked up my AppleTV today. After syncing it with most of my video library and some of my music library, I tested the video appearance. My initial setting was 1080i, and I experienced major video/sound synchronization delays (similar to older DVD players where you'd hear what the person was saying 5-8 seconds before they said it on screen). This drove me nuts, so I switched down to 720p res, and while the movies played okay, the TV Shows and the Music Videos left much to be desired, and still had the same synchronization problems. To remove these issues, I finally changed the res down to 420p, but now, when I watch pretty much anything (photos, album art, TV Shows, Music Videos, and Movies), the resolution is horrible, and pixelates on my TV.
I'm trying to pinpoint this to find out if it's the TV, the connection (HDMI), or the AppleTV. Can anyone offer some advice on what to look for, what might cause this issue, and how I could fix it? Thanks so much in advance!
AppleTV Windows XP
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Sounds to me like it's a problem with upscaler. Does the Apple TV upscale? If it does, then it's the upscaler in the Apple TV and is probably a software problem that can be fixed with a firmware update. But it's weird that if it's a consistent problem with the Apple TV upscaler that these forums aren't just soaked in complaints about it. Could be only a problem with really large, say 46" or greater TVs -- that might explain the low number of complaints.
If the Apple TV doesn't upscale, then it's the upscaler in your HDTV. Prior to about six months ago, when all HDTVs got good upscaler chipsets, some HDTVs, especially the older, larger models, had absolute trash upscaler chipsets -- even the expensive quality brand models got some bad upscalers. All kinds of problems from all input sources, but not always with every device. How old is your HDTV?
For your sake, I hope it's an Apple TV upscaler problem with larger dimensioned HDTVs, as that Apple can fix for free with a firmware update. Next best choice is your terrible upscaler chipset in your HDTV supports firmware upgrades via USB or network cable and there is a firmware update out that fixes your HDTV's upscaler problems. Because the final, worst alternative, if there is no update for your HDTV available, or your model doesn't support firmware updates, it's the really bad option: drop another couple grand or more for a new HDTV of the same large dimensions.

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