Dan,I got to run a 750 Homelite, that saw would make a pile of chips in a hurry. I wouldn't want to carry it all day.
John T. you are right, we don't know the O.P.'s needs or budget. That is why I made no suggestions about a specific saw but talked in generalities.
A plastic crankcase is plenty strong but is too heavy and they don't hold screws well.