Er, really fat? It'd be almost entirely a snow bike, and I'll probably run studs for 90% of the riding. The local trial-maintaing club up here (
NEMBA) does a fantastic job on the singletrack in the cold season, and every time I'd be hiking/shoeing this past winter I'd be jealous as fuck of the fatties cranking by me.
I've got a MTB I'm super happy with, so I'm going to just go all in (sort of) on a solid snow bike. Those Motobecanes do get decent reviews, but I'd like something a bit higher end and with as much float as I can swing for around 2 grand. My usual LBS is a Giant/Rocky Mountain dealer (and I believe RM has some coming out this season), along with the Origin 8 stuff. The Origins look great for the price point (~$1500 or under) but I'm not wild about that Nuvinci internal gearless setup. According to MTBR it's pretty solid, but I want something that I can work on myself and toss a 42T on.