This is just my view and this is, of course, your project but I'd much prefer the regrading be based on reference material than on an opinion of what looks right or wrong. Perhaps the DVD may not match the original theatrical colors exactly but without a reference it all becomes subjective and at worse risks becoming just another 'revisionist' version of the kind that put many of us off the BR in the first place.
In short, I'd take the ColourMatch pill without hesitation. :)