I'm considering getting a chain saw to maintain a trail behind my house (and turn the plunder into firewood), and for the occasional scrounge. I'd like to keep it cheap, $150 or so, and will be scoping craigslist and maybe pawnshops. What are a couple good options? There is a Stihl MS170 nearby for $125 that's only been used twice. Good idea or not enough oomf? Thanks.