Blu-ray player or upscaling DVD player for DVDs with 1080p HDTV?

Are there any differences in image quality between an upscaling Blu-ray player and an upscaling DVD player when DVDs are viewed on a 1080p HDTV? I'm mainly pondering if I should grab Panasonic DVD-HTIB SC-PT480, or Panasonic Blu-ray-HTIB SC-BT230. The price difference here is about $200 ($250 vs. $450). I... show more Are there any differences in image quality between an upscaling Blu-ray player and an upscaling DVD player when DVDs are viewed on a 1080p HDTV?

I'm mainly pondering if I should grab Panasonic DVD-HTIB SC-PT480, or Panasonic Blu-ray-HTIB SC-BT230. The price difference here is about $200 ($250 vs. $450). I know there are other considerations, such as possible price parity of movie releases on both systems in the future, which would make buying Blu-ray movies more attractive option, but for the purposes of this question, I'm mainly interested if the results are identical on DVD upscaling.
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