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You'll find that any display device will benefit from calibration using a test disc especially when factory settings are likely to serve only to distinguish one model from another in a retail environment.
Given the large investment in your plasma screen, the relatively minor investment in a test disc will squeeze out some improvements in picture quality.
As for the NTSC issue, if your hardware is all compliant and your software collection is mainly R1, it's definately worth trying out (plus you should be able to save a picture setting specifically for NTSC signals whilst having another for PAL sources).
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