Boss1,
I have to echo what Hu said about "the nc manager is worth the price difference".
Add in the new Multi-logic toolpaths, advanced filleting and toolpath preview,that come with the Xp series and to me "It's a no brianer". And the price difference from Mill2000 to Xp pro is not a very big leap.
But you can't go wrong with either series of Onecnc, at any level.