I would go with a Stihl.
My dad cuts 20 plus cords of firewood each year. Not pine but oak and he has had 2 Stihl model pro ms 260 with a 20 inch bar (usually lasts about 10 years each). I have the same one with a 16 inchch bar and it has been great the last 8 years.
This model is probably a little oversized for what you have in mind but check the other models out.
This saw has been replaced by the pro 261.