Knminton, what is your concern with needing the G80 locker?
In three Michigan winters (two of them the worst in the past 15-20 years?) I never wished for having the G80. I was adding between 240 and 400# of water softener salt to the van though. I actually felt the van was better in snow than my Chevy Cruze I had at the same time.
As carringb stated, the stability control and traction control is what helped me in the winter. There were times two tracking on a dirt road that I know having the G80 would have been beneficial, but I was just smart about how far into the woods I would venture.
Good luck with your search and decision.