Well my Craftsman 42cc 18" is getting tired and I need a bigger better saw. My grandfather has a old Stihl 031AV, must be over 30 years old, so a Stihl it will be. My local dealer has suggested the following models for a 20 inch bar, the MS290, MS310, MS390, and the MS361. He says its toss up between the 390 and the 361 for my 'weekend" usage. What would everyones opinion here be?. It will mainly be used for cutting trees in our subdivision and firewood.