being a former logger and climber/topper. Either a Husky or Stihl, whichever has the best service locally. Get a pro model, not a homeowner special or anything that says "farm" on it. Smaller it is the easier on your back it will be. Just depends on how much chain you're trying to pull. If you expect any saw to be reliable learn routine/annual maintenance. Stabilize the fuel before you put it away, change the fuel filter every spring after filling with fresh fuel. Also maintain your air filter for optimum performance. The suggestion to run premium isn't a bad one either. Run actual bar and chain lube and not old motor oil. If it's cold, get winter weight. Flip your bar every time you remove the side cover to clean the oiler and port in the bar. there's more but that should get you started. Also, never run a dull chain. It's just hard on you and the saw. Touch it up often, or have extra chains with you to sharpen later.

Edited to add, they make premix with stabilizer in it.

Last edited by ykrvak; 10/21/17.
Because through judicious handloading and a bold sense of optimism, you can make anything into an .88 Magnum - once! 😁 - chesterpulley