I live in MN as well. I had a 2011 SBA and 2012 Pro RMK last year. Granted we never had much snow last year, but I didn't put one mile on the SBA. Every mile I put on was on the RMK outwest. For 2013 I have a new RMK coming and sold the SBA.
I found the SBA to be a very good machine on and off trail. However, it was not great at either. My biggest complaint in the mountains with the SBA was the ski stance. Tree running I cound't fit where others could. Secondly, it seems like when it was put on its side it had a tipping point I could never get comfortable with. If your group runs 155" or 163" outwest you will not be happy with a 144". As a matter of fact, some groups I ride with wouldn't let a 144" tag along. Perfect world would be a 155"/163" RMK for outwest and a Pro-r/rush for in MN.
Good luck with your decision. However, if you buy the SBA and continue to travel outwest, I will put money on the fact your next machine is an RMK. I would say over 75% of the people who had a SBA in 2011/2012 that bought a new machine bought an RMK. This is merely an observation from looking in various forums.