For your app, which is a lot similar to mine as I live about 300 miles south ward of you, is to go with the MS250 and keep the 16 inch bar. I have one of these and the MS 261 (a pro saw) and really like them in this size range - the .270 equivalent in chain saws.
Used my 250 yesterday in fact to clear a bunch of sweetgum up to about 10". Its a beast! And as a sixty-something, its a lot easier on the back than my larger saws.
