Go with a 660/661. I run all stilhls doing tree work and all husky at the wood pile. For years I climbed with a 3120 with 36" bar doing the trunks on tulips threw out Westchester county. For me I want the power, I'm not gonna waste money on ms250's etc, were tree workers not florists You need to determine what species of trees your cutting mostly to the saw you buy. You can run bigger bar on smaller power head in soft woods. Ex 460 with 32" bar. That combo cutting hard sugar maple n hickory will not last long. I have 2 460's with 28" bars we use mainly on soft woods. It's better to have more power for the bar then less power n demand more bar.