I have an MS261 with 16" bar, does all my fire wood every year and quite a lot for my parents, probably should have got it with the 18" bar. Also have a stihl 25" bar with new chain that I got from a scrap heap, looking for a good used saw that would run it.
As others have said all the pro saws are pretty good, having a decent dealer is more important and my local Stihl dealer is very good.