It's very easy to screw up your ankles or feet so don't go cheap, like they say get used if you have to! Unfortunately I had my tech 8's cut off my feet after a major crash where I broke my femur last summer. That really sucked as my backups are tech 3's which I find don't have that great protection.
IMO the sidi adventures are not suitable at all for serious dual sporting, ok for occasional gravel roads but on the trail no way.
By the way I bought the tech 8's used but in mint condition for half the price of new ones. Bit of a fluke finding them on craigslist given that I wear size 14!
XR650R dualsport/Rally Trainer
“We should come home from adventures, and perils, and discoveries every day with new experience and character”