how does the IOR line of scopes compare to the Nightforce,USO and other higher end scopes? I am finally ready to purchase a higher quality and higher magnification scope than what I currently have. My best scopes now are a Mk4 3.5-10 and a SS3-9. I am looking at the IOR SH edition 3-18. I have no idea about high quality optics, but it needs to be MIL/MIL and FFP.