Buying a Backpack leafblower?

Ok im looking for a backpack leafblower. I have had a handheld echo blower for three years, but know have recently moved to a place with a ton of trees, which means alot of leaves, and the handheld is ok, but would like some more power, and it also gets tiring. Ive been impressed with echo, but ive seen other brands too and heard from different people saying others are better than some. So im looking at either, Shindaiwa, Kawasaki, Echo, or Stilth. I see alot of yard care places using the stilth, is this because they are good, or just good price. Which one would be the best choice for moving lots of leaves, has lots of power THANKS