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My advice is, if you have a lot of work to do buy the biggest best saw you can afford, your back will thank you.
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I fed my wood stove 3 cords a year for 12 years with a 42cc craftsman saw that I stuck a 16" bar on.
I do not recommend a craftsman saw, even though I had great luck with mine. I recently replaced the craftsman saw with a jonsred (made by husqvarna) 50cc saw. That saw is one of the "mid grade" saws that's built better than a home owners grade saw, but not as serviceable as a pro saw. A quick way to tell what you're looking at is by the "emissions compliance period" on the tag. The home owners saws (that I'd avoid) are like 50 hours. The next step up is 300 hours.
I'd recommend something like the saw I just got. For your uses, I'd say something in the 45-50cc range with a 16" bar and buy two loops of full comp, semi chisel chain. That should do 95% of what you'll need a saw for. I have a bigger pro saw for when I run into bigger trees, but like i said, I've filled my wood shed a lot with the little craftsman saw.(don't buy the craftsman saw).
I finally replaced my craftsman saw this year, because I got mad at it when I was out cutting wood. I quit wanting to start when it was warm, so I ended up having to do all of my cutting that day with my big saw and my lower back was smoked at the end of the day.
If money was no object, I'd have bought a stihl ms261, but they are expensive. That would probably be a great one saw option for someone who doesn't cut 20"+ trees very often. In the end, my good luck with my cheap saw made me second guess my buying a pro saw and the jonsred I got on clearance for a great price and that was that.
Tldr; don't go buy a giant saw, heavy saws suck to swing around all day. If you dont have any, buy a pair of chaps, get good chain and a mid grade or pro grade saw between 45-50 ccs and run a 16 or 18" bar on it.