I managed/ worked at a tree service for several years until being sold. I have used just about everything and personally own saws ranging from a sthil 026 to a husky 3120. What size saw are you looking for, or what do you plan on doing with it?
Husky/ johnsord/ and redmax are all made by the same parent company and share alot of parts and technology.
Someone mentioned dolmar they make a great saw for the money. Look for the makita badged ones.
Sthil makes a good saw as well.
I would stay away from saws sold at big box stores and get a professional saw. They tend to be lighter and more powerful than the homeowner versions.
My favorite/ most used saw is a non epa husky 346xp with 18" bar. If you combine that with a husky 372xp or sthil 460 you have a combo that will handle almost any cutting need.
If you have any questions let me know.