I find it amusing that the majority of the posters on this site recommend Kubota tractors which aren't cheap but shy away from a good quality chainsaw. my advice is to spend the modest amount of extra cash and get a Stihl and if taken care of it will be the last saw you ever buy.
I have a big field to mow, lots of dirt work, and make a garden every year. So I can easily justify my Kubota. I can't justify an expensive saw sitting in my shop 99.9% of the time.
Stihl and Husky a "little" more expensive than a Poulan or Homelite? Not in my area! Prices in my area are breathtaking, about 4x more.
I still say that 4 18" Poulans will outlast an 18" Stihl or Husky, and cut just as fast.
My $120 Poulan can do something a Stihl or Husky can't do: When it wears out and it's time to get another (in 10 years?), I can use it to cut tree roots. I bet you wouldn't dare use yours for that!
