The ported 3120 in the classifieds is a heckuva good deal. You wouldn't be lacking cutting any dang tree on this earth, tell ya whut...Two bowl of wheaties saw for sure....proly make it pay for itself cutting up big wood for like table top slabs, oak beams, etc...
For a stock saw..and since you seem to like stihl saws..buy a 661 if you want a saw to just start and use it like a tool...they are more than capable of pulling a 36" bar in stock form.