I currently have STHIL MS170 and MS250 chainsaws. Both are no longer reliable and I never really liked the 250 (pain to start). I own a farm with about 80 acres of bush which ranges from eastern cedar to ash to oak. I use my saws every other week so and I getting tired of fighting to keeps the saws reliable. I am looking for a moderate power (50+cc) with the ability to use a 20" bar. I would like to stick with STHIL (have pole saw/brush trimmer) but would consider Echo or Husky. Any suggestions?