Blower question.... What do you all think is neccesary as far as CFM or MPH in terms of a backpack blower. I want one that will get the job done, not something that is like a home duty hand held blower mounted on my back. I'm looking at either a Echo PB46LN, Redmax 6200, or a Stihl BR400. Anyone use any of these, whats the best? I know the echo does 380 CFM, has a 44 CC engine, a max airspeed of 175, and 800 CFM in the housing. What do you go by, I heard the MPH is normally very inaccurate and it just depends on the size of the pipe. Is the CFM in the Housing the most accurate thing to compare to? How many CFM are your blowers, how many CC? What do you all reccommend? How many hours is a blower good for? Any idea what it costs to rebuild them?