I"m running a Husqy 353 and a Stihl MS311, both with 20" bars and don't really see a need for anything bigger. Now if you're planning on lumberjacking for a living then maybe a bigger saw would be apropos. I've got 3-4 100ft+ black spruce on our cabin property that have been spruce beetle killed this spring and will have to cut them down and either of those 2 saws will get it done. Spruce beetle infestation is bad this year.
So then the answer is looking more and more like just get a twin of what I have and maybe just be fine with a pair that have 18 inch bars then. Since 18 is what I"ve run forever and have chains etc.. or buy one spare longer bar and couple of chains just in case...
