+1 on the Echo. In my opinion it’s not only the best value of the three but also the best saw. I don’t know if it’s the fastest or slowest saw of the three but it’s got plenty of pep and great reliability. Echo also offers parts well past their legal requirements and they don’t hide their parts diagrams from their customers like Stihl does.
I know very little about the Husky homeowner saws. Husky builds the Poulan Pro and Jonsered saws. I’ve had some of them come into my shop with very few hours on them and needing work. Let’s just say I’m not impressed with them.
The Echo will run great without mods but just like most other saws you can gain a bit more power with a tune and muffler mod but it will also make it louder. Whatever saw you buy just run it stock for a while. You can always tweak it later if you decide that saving a few seconds per cut is important to you.