Have you considered the Vortex Razor II 1-6 or 3-18? Re: price alone they have an advantage over the equivalent Steiner or Leupold and I've yet to hear a complaint about Vortex's warranty service so if your SCAR-17 chews up the optic, getting a replacement shouldn't be any trouble...
The Vortex HD II 3-18 and 4.5-27 are two of the best buys out there in the optics world. Loads of capability and desirable features, great glass, well built. Hefty, but solid.
I'm not partial to their lower end scopes, but the HD II's are legit.