I am in the market for a new rangefinder. I have a Leupold rx1000i DNA model and its just not cutting in anymore i have a heck of a time getting it to pick anything up after about 550. I use it mostly of elk and coyote hunting. I would like a rangefinder i can reliably range a mountain side or a rock pile in a fiel out to 1000 yards or so. I have it down to either the new leica 1600b or a ziess does anyone have any experience with either?