Like has been said, make sure you get a two stage. I know nothing about the expensive fancy ones. The typical $500-600-700 ones, all the same. Sears, MTD, Troybuilt, Murry, etc, they are all made by MTD.
Mine is a 24 inch 6hp 2 stage. My neighbor isn't home in the winter. I keep her driveway cleared for her family. No snow last year, but the year before I had a blast clearing it. I didn't clear it until it was well over 2 and a half feet deep. Had no problems at all. At that depth you have to cut into the snow in narrow sections because the snow falls past the chute into where you already cleared. Lot of fun though when there isn't a house right next to where you are clearing. Fun shooting the snow 20 feet in the air.
I bought the snowblower to replace using the tractor and plow. Halfway through winter the pile of snow is too huge to plow any more and I can't clear the driveway any more. The snowblower is the best tool I've ever bought. It is a necessity where I am unless you have a big farm tractor. A little 20-25 hp gerden tractor with a plow just doesn't cut it.