I bought a pair of Asolo TPS 520s in 2011, which I mostly enjoyed. However, the soles only lasted 2 summers on Glacier's super duper crumbly rock. I resoled them with a thicker Vibram sole and was able to use them through last year. Last autumn I bought a pair of Alico Ultras, and I really like them so far. They appear durable, so hopefully I use them for many years to come.
Ankle support of 5-6" and a thick sole are two requirements in my opinion for hiking on this type of terrain. A full rand is also nice to have for added protection, as it's common to knock rocks onto your toes. As important as study boots are, equally important is Goretex gaiters to keep pesky rocks out of your boots.