i find it quite interesting that no one has brought up the gas powered saws. Its basically a 14" grinder. When I'm out in the field I use the saw to cut up whatever I can, when something is too awkward or I cannot reach it I break out my little torch set. I picked up my victor torch and victor gauge and two airgas tanks at an auction for 80 bucks, I hardly use it but its nice to have.

Also with the big saw I like to cut my electric motor cases. Its quick, and it cost a lot less then a 4 1/2" grinder.