My question is I like the Stihl MS 250 18" I have about 30 more trees too take down. Sizes from 2" to 24''. Plus the cutup that goes with the felled trees. I can trade the MS 250 back do the dealer Monday. He can order me the new MS291. Shoud I stay with the 18" or go with 20"? Or is the MS 250 enough saw for what I'm doing?