I am getting a Husqvarna 455 rancher for next to nothing and it is a good running saw but there is no bar or chain with it. I was thinking of getting a 20" set up for it because that is what I was told it came with, but just out of curiousity what is the biggest you guys would run on this saw it is all stock. The Husqvarna website says 20 is the largest recommended. Thanks.