Hi Mo. I have the model with FWD and the 6 speed manual transmission. I haven't had any issues with power at all. I do find that if I have it in sport mode and hit larger puddles, it can be a bit skittish but other than that, it is a blast to drive. I am in MB and we probably get as much or more snow as you do in CO. I didn't get the snow tires because mine is a lease and although I almost got stuck once or twice, it was after a very heavy snow and before the plows cleared. I drove in a blizzard last year and my little Juke made it through.
It is probably the most fun car I have ever owned. Both Tony and I felt it was also the easiest to get used to driving. We both got in and drove without feeling the need to get used to it at all. I drive his Matrix once in a while and always feel a touch uncomfortable the whole time.
Other than routine maintenance, I haven't been to the shop once and I have had mine for over 2 years. this is my second Nissan and they make good vehicles that are reliable.
Let me know if you have any other questions.