If the saw will be sitting that long just rent one when needed.This is a good question, the topic of a conversation with a friend this past weekend. My "supplier " has two 36"+ Ash trees that the power company is taking down. I have a CS-620P with a 24" bar that will do the work but will take awhile.
I cannot rationalize Stihl/Husqvarna prices for a saw that will sit on the shelf for 360+ days a year.