Just replaced my MS170 (30cc) today with a MS250 (45.4cc). Its 15cc more for only a 1.5lbs weight penalty, according to the manuals.
The Abbotsford Stihl/John Deer dealer were a bit pricey considering how close they are to the boarder. http://www.stihldealers.ca/Search.aspx/Abbotsford/British_Columbia/BC/V2S_8E5/PrairieCoast_Equipment_Abbotsford/chainsaws.html?Lang=en
They wanted $400+tax and wouldn't move on that price. I even suggested its cheaper across the line and they meet in the middle. No go.
So, 15min drive across the boarder to the Stihl/John Deer dealer in Linden and I got the exact saw, inlcuding a second chain and a can of the per mix gas Motomix for $353 taxes in. Declared it at the boarder and was waved through without paying HST. I saved about $150 if I bought everything at the Abby Stihl/John Deer dealer