I really like my Vaya, and I regularly ride it on the roads as well as on the trails. I have the itch for another bike, and knowing that I already ride my Vaya year round made me think about when I would not ride it. I would not ride it in the snow, and I would not ride it on the trail right after a heavy rain. That is what drives me to ask the question: Should I be looking for a mountain bike with the "plus" dimension that the LBS describes (either 27.5 or 19 x 3 inches) or should I just go buy a fat bike? And, as described above, the LBS does not have a bike of either type in the price range that I am considering (< $1000).