Hello, I have a question on blenders.

I've destroyed 3 chepo blenders of the years during what I call normal
use. The first one the motor burned out because it didn't like being
use more than 5 minutes without a break, the second one, a Breville
Classic, the plastic coupling under the blade broke, and the third a
Kurps processor/blender combo, the gears inside stripped after I
accidentally pushed the wooden spoon in too far when making tomato
pure.
So I'm looking for quality blender for my kitchen and expect it to be
very reliable and have it for many years (kind of like pass it down to
my grandchildren when I'm too old to cook). Having done some shopping
around it seems there is a big price leap between domestic and
commercial blenders. There is about a 3:1 price ratio between the
'better' domestic brands and a basic commercial bar blender. Is it
better in the long run to spend the extra cash and go for a commercial
unit ?
Here is a link to the blender I'm considering
http://www.semak.com.au/blender.html

Also, which is a better jar material to use, the stainless or
polycarbonate ?