Well, Marc,
You started a large discussion, I know that you and I are outnumbered on brand choice of saws, but I wouldn't be caught dead buying one of those other things. In my years of being in the wood business, I have found that it is better to stay with what you are comfortable with using. To me, this means using a Husky professional model 353 (yes that is a large climbing saw but to me there is no substitute for cutting fast) with a 16" bar (I don't like those top handled saws because they can't power through the cuts over 3 inches and then have the bar drop out of the way of the branch or piece of wood) for the smaller cuts, then going up to a 372 (you will have to buy a 575 now, which is better than a 372) with a 20" bar for when you have all or most of the brush off. When you are up to the 20" plus wood and you need to be able to cut in one pass, switch up to another 372 or 575 with a 28" bar attached. We also have a saw (3120) with a very long bar, but in the past ten years, we have only used it a few times. If you only use the longer bars when you have to, you will sharpen many fewer teeth when you hit the inevitable concrete or other foreign object. We take down the biggest trees in our area and these are the three main sizes of saws that we use. Personally, I carry a pair of 372's (one with a 20" bar, one with a 28" bar and a 32" bar & chain that I can put on for those trees that a 28 just can't get through cutting from both sides) and an old 362 in my truck. No Husqvarna has ever let me down.