The past couple years of global warming have convinced me I need a good snowblower for my son. He shovels three homes, his, his grandparents, and his elderly neighbor. This global warming is wearing him out. He also sees the opportunity to make some extra income with such a machine. I'd prefer function over fancy, just a plain old hardworking TW-like machine that gets the job done. Drives are about 20x50 feet, but sloped, so getting back up the hills is important. I'd like a 120 volt electric start and tracks. I also wouldn't mind a good used machine so someone else eats the depreciation. Suggestions from those with experience?