I have zero experience with the Echo but I hear good things about them.
I do know that Echo has been making a LOT better performing saws recently.
The Husqvarna is toast. A decent Dolmar 6400 will spank them with amazing regularity.
The Solo, being basically the same saw as the Dolmar with a longer stroke should handle the Dolmar and naturally the Husky.
I've cut with Kevin's Poulan Pro 415, and with the POSSIBLE exception of the Echo, nothing on that list will cut with it!
The others would have a much better chance against my 415 (which is a great running saw) but Kevin's 415 put mine back in the truck in short order.
Mike