Well if you guys don't mind the Stihl saws for a smaller unit, I'd recommend the Stihl 250.
That little saw I have has cut WAY more wood that it is supposed to and it keeps on chugging. Perfect for limbing but I've cut some bigger timber, just not very quickly.
The only thing I don't like about it is the quick "open" gas cap. I had to replace one because the springs wear out inside and it won't close. I bought two, so I have a spare in the woods with me. They're cheap, $6-8.
