I was wondering if anyone out there has used the stihl MS390 and MS391 and what they think about those, or should I go with a Jonsered 2159? My price range is between 500 & 600. Right now I'm using an MS290, but want more power. I like the 64.1cc's of the 390 & 391, but don't like the extra weight the 391 carries with the new model. Or, should I go with the Jonsered 2159 and get the professional saw? Don't know which would cut faster. I'm looking to put a 16 inch bar on either. Any thoughts?