My Stihl BR-400 is getting mangy. I need to retire her. Repairs are getting too frequent. I've heard a lot about the Red Max 7001 and the Echo 650-700 series. I lusted after the Red Max early this spring, however, I've heard good things about the Echo. Which one, in your opinion, is the best? and why. And what about the others? Sindawi, Stihl 420 etc. I have a Robin as a back up, it starts easy but is no contest to my Stihl 400. When I have to replace, I'd like to upgrade.