Just remember: that's
with it and not
to it.

What are you running for a brake on that and how do you like it? I agree with the comments that a NR factory ACR is a game-changer, and would really compete with (bury?) the XCR.
I totally agree with you on this and will actually push the argument further and say the the custom barrel option is still a good option for someone who really wants an NR ACR, because waiting for the factory NR ACR could take a while.
A quick cost breakdown:
Used ACR - $2,450
New (quality) barrel & Ceratoke finish - $1,100
Shipping - $50
You're in it for $3,600 or so. It's a good chunk of change no matter how you see it.
New Tavor - $2,900 + HST (13% in Ontario) = $3,275
(yes I know, could have put a price for a used one too, but again, for sake of argument)
Shipping - $50
You're in it for $3,325
A factory NR ACR @ $2,999 + HST 13% + Shipping will run you $3,325. With the custom NR route you at least get to choose the barrel profile, finish, twist rate.
For someone who's looking for an NR rifle, of standard / conventional design AND doesn't want to go with a PE90 or an SL8 build (cuz who keeps them totally stock), I think the custom NR ACR is an option not to be overlooked for a $300 difference
Vs the Tavor.
An undeniable advantage for the ACR is the fact that you can put a really nice Geissele trigger in it if you want too. I can only imagine how quickly they would sell if one would be availble for Tavors!
Whether or not it's worth it for $3,600 is a whole other matter.