Not sure why all the recommendations for a 20-24" bar to make up to 10" cuts. A 16" or 18" bar will be plenty enough, and will spin faster than a longer bar/chain.
Get something between 50-55cc with a 16-18" bar and skip chain. Keep that sucker sharp and watch it walk through wood like butter.
Landowner vs pro lines not sure that it matters much just buy a quality brand with good support from a local shop. Stabil/Seafoam for storage when not in use.
Longer bar......less bending over. Easier on the back. And skip chain on a short bar is gonna chatter..... And unless you go stupid on a bar length........the length of chain means little in chain speed. The sprocket will decide that.
