As has been said here before, the right tool for the right job.
I am on my third single stage unit since 1978. Don't see the point in using a sledge hammer when a rubber mallet will do the job.
I have gone through 12" before with all three that I have owned (two Toros and a Craftsman.) Sure it is pushing the equipment to the limit but it does it on the FEW occasions that it is necessary to move that amount of snow. If I lived in an area like the northeast or upper Midwest where heavier equipment was required. I would buy it. For me the reasons for not owning a two stage is NOT cost factor, it is 1) weight of the unit, 2) storage of the unit, and 3) proper sizing of the unit to the application requirement. I can do my drive, and the sidewalk of the whole block in < 20 minutes. I would look ridiculous doing that with a two stage.
As for brand of unit: even though I owned a Craftsman which gave me good service, I would say Toro or Ariens only. A couple of years ago, I bought one of the last Toro 2 strokes with electric start. I have discussed it on this site, and know several of the members have the exact same unit. Does a nice job and will throw some snow. Hoping that it will be the last one that I will ever buy.