My last two I had are now discontinued I believe, the Horizon 2 and the Falcon, check Sierra they have good deals on them.
I have had 3 pair of Asolo and they just work for me and take a beating, I have a pair of the 520 which are heavy and stiff mountain type boot, but they are going on ten years old I bet and still holding up and still waterproof.
The 520 were not my primary boot most times but have been getting a lot of use recently.