Chainsaw Repair

Had a friend visit yesterday to pick up a vintage electric drill for his tool collection and as he was leaving he asked for advice. he wants to know which is the best mid range stihl saw to buy My answer to him was I was not up to speed on modern saws but would seek advice on a couple of forums I belong too.
 So after some discussion he wants to run an 18 inch bar cutting dry Australian eucalyptus/gum. Also he is not stuck on one specific brand especially as he realises how much Chinese plastic is on modern saws. Another advantage is he will be able to buy the saw in the USA when he goes home to Georgia for a visit this spring/your autumn. So I am asking for input from forum members on what there thoughts are for a suitable machine   so stihl husky  let me know your thoughts thanks

Is he a pro or weekend warrior and what is eucalyptus like to cut? I assume it is quite hard. An MS291 might be a good choice if it is for occasional farm use. Price is good but it is heavy. A step up would be an MS361; fast, relatively light and will handle most anything with an 18" bar.

Dry Redgum is hard stuff he would cut maybe 3 ton a year I should have asked him for more info one saw he did ask about was the ms 250 he is currently using a 170 he said it gets the job done but takes a while to do it And as I mentioned he will be back in the states visiting later in the year he will have the added advantage of buying over there. As a young man he cut pulpwood with big ol homelites and bow bars. He has given me a fairly good understanding of how and why the bowbars were used