I would agree with anything from 3-9 to 4.5-14. Burris makes a very good 4.5-14 with ballistic reticle, Leupold, Nikon and many other manufacturers make comperable scopes. I like the 4.5-14. I have not used a Minox scope but their binos are good. Yes, 2.5 would work but I really do not think you will notice any difference between 2.5 and 4 or 4.5 magnifcation. What distances are you looking at shooting? What is the closest distance and what is the furthest distance that you think you will be shooting? I have been using a 3-9 for several years and never had any problems, just at long distance there were times that I would have liked a little more magnification.