Take a look at the Bausch and Lomb 3200 series a 3X9 will set you back about 200 dollars, great optics, repeatable adjustments, sufficent magnification for long shots on the high end, low enough magnification for closer and moving shots on the low end. Does not have target knobs but it is finger adjustable and I don't really think target knobs are that great of a thing for most applications. Long range precision rifles are the exception. Will be sufficent for the full range of the 6.8s capabilities.