I have the Toro 2450 GTS, very similiar to the Powerclear. Has the 5 HP Tecumseh 2-cycle, there was a 3450 that had I believe the 6.5 HP but not worth the extra $$$ IMO.
If I had to buy all over again, I would get a 2-stage, mainly because the price of this Toro is within a hundred bucks or so of a smaller 2-stage.
2-stage is great when the surface has been packed down a little and there is ice chunks in which the auger will break up. The single-stage Toro I have works fantastic, however virgin snow is best, as it packs down under tires it takes more time to clear and sometimes it can't.
The single-stage Toro will toss some snow though don't get me wrong, 8" of snow is no prob and will chuck it about 30'
A plus to the single-stage is virtually no maintenance, had mine 5 years now and only need to run the tank dry every year.
Clear when the snow is about 8" or less and you can walk with it. When it's about 12-13" it will clear but needless to say it's much slower, this is where the 2-stage shines but it will still work.
This is about 13" and is over the top of the front of the opening.