@danmar123 , et. al. : Agree w/ general assessments and recommendations. I don't think the GR/GR2 would offer much over a fully upgraded KAB. I view them as equals. Now, a G on the other hand... I'd view this as a definite upgrade. I wonder though, wouldn't you be tapped out in terms of upgrades once you go with the 4k G?
I like products that have an entry point and then offer various paths toward upgrades. The Rega line I think does a wonderful job.