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I have never seen 200% NTSC - don't believe it's possible except as a typo.
Monitors that do better than 95% or so NTSC (or Adobe RGB, which essentially has NTSC green and somewhat less orange / more saturated red) will be so close to the 15GP22 that's it's not worth worrying about. The standard sRGB or HDTV monitor covers about 70% of NTSC, mostly due to the yellower green. In fact, since LCDs don't have the purity problems that a CRT can have, and also have blacker blacks, they will do as well as the 15GP22. especially in the lowlights. The only drawback I can think of is that wide gamut monitors are generally more expensive.
By the way, 70% is measured on the 1931 chromaticity diagram, which does not correspond to uniformly perceptual color space, so you are really losing considerably less than 30% of perceivable NTSC color space in a HDTV; but the differences in greens and cyans should be noticeable.
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