Poulan Pro chainsaws are renowned for thier high preformance, durability and quality. Some chainsaw users would have you believe that the Poulan Pro range of chain saws is better than Poulans stanard range.
And to be perfectly honest, with the exception of the forged crank and lined piston there is not much difference in any of them. If you keep any of the chainsaws mentioned well maintained and looked after there is no reason why you should not be able to get a few years of hard sawing out of them.
Would I recommennd a poulan pro chainsaw for heavy duty work? proably not, but if it comes to brush or firewood, a poulan pro is likely the chainsaw for you. I would expect you to go for something in the mid range like the Poulan Pro PP4218AVX. This saw has an 18" bar and chain. It also comes with the usual features like the Anti-vibration handle which improves comfort and safety, fited with a reverse sprocket the saw provides easy tool-less chain replacement.
When it comes to tree management It will have no problem felling trees with a 12" to 15" diameter. If you start to saw wood which has a larger diameter than this it is quite likely that the chain will begin to slow down or stop midway sawing through your branch. I would have to say that you would be safer going for something bigger.
Adding another 2" to the bar and a further 8ccs of power to the engine the poulan pro PP5020AV is your next choice of saw. With that little bit of extra power it is likely that it will give that extra bit of piff to get your project done.
When it comes to pricing you are going to pay around the $150.00 mark for the Poulan Pro PP4218AVX 18-Inch 42cc 2-Cycle Gas-Powered Anti-Vibration Chain Saw with Case
For the Poulan Pro PP5020AV 20-Inch 50cc 2 Stroke Gas Powered Chain Saw With Carrying Case you can expect to pay anywhere from about $200.00.