12\" fresh powder
From my limited experience now, I'm definitely happy with the Ti rather than carbon. I'm not worried whatsoever about the frame despite our winter conditions. I've now had a few rides in pretty poor conditions.
previous reply mentioned a 650 wheelset with a bit wider tire. I imagine you could run slightly lower pressures as well which would help with the ruts.
The bike cuts through 12" of powder snow fairly effortlessly. Everytime however that I find some packed tracks, the tires slide off and really shake you. It is almost amusing at how wildly you can get sidetracked. Roads are tough as sometimes the wet packed snow will let you stay on top, but sometimes you cut through without warning.
My MTB with studs was easier with the ruts, but didn't slice through the snow as well. A bit of a trade-off for sure.
By the way, the neoprene bike mitts are awesome.