All HD cameras use rec.709 color space.
I think you're asking the wrong questions though. What you want to know is:
resolution
interlaced or progressive (or both)
compression
chroma sampling
All affordable HD cameras have a different "balance" of those above, but in the end, there's not too much in overall quality between them. You make the choice based upon features and NLE support.
Graeme
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http://www.nattress.com - Film Effects and Standards Conversion for FCP