Unless your average snowfall is less than a few cm, you may want to try
something bigger, particularly if you're pushing loads more than say, 10
meters.   Remember that as you travel further, the load on the blade
increases, and if the snow's wet, you could easily have 2 tonne of material
in front of your blade.    If you have a large piling area, you might be ok,
but if you have to push back the piles to make way for fresh clearing, you
might run into trouble.     Also, 4 wd is a big help and a larger truck will
push a heavier blade, which is useful for scraping up ice buildup and stuff.
You'll need at least the sonoma to power the hydraulic system,   I'd
recommend at least a full 1/2 tonne with 4wd.

-JD

Howdy Fred
   A S10 may be a bit light.  I would go with at least a K20. ( or
   dodge equilvalent) A few years ago i used a 74 K30 w/ a 6 foot
   blade.  Was lucky to get 7mpg when plowing 350/4b carb.  Had to
   rebuild the steering gearbox at least once a year.  The seals
   (o-rings) would blow from a sudden shock to the system. You may want
   to get a blade with right or left angle to move the snow to the
   side.  If so, get one that is hydrolic, not pined.  It is a pita to
   have to lift the blade, get out pull the pin, change the angle and
   put the pin back.  Plus i've seen the pins shear, when angled.
   Another thing.  Get an extra fuel tank.  Unless you've got a 24 hour
   7/11 real close.  That may or may not be open when the snow is deep.
    Pushing snow uses gas like crazy.  

BTW i added a extra heater core that i picked up at a junk yard.  I
could plow in shorts and a tee shirt.  O ya, that was in Mich.