Ideally you want to pick the binos with the porro prism lenses. If you want to find the better set, talk to some birdwatchers. They are noted for knowing the in and outs of optics. I don't really spend as much for binos as I do for my scopes but the Kahles and Steiner's that I have seen have been excellent quality. You don't say what your intended use is but like I said talk to some birders and they'll point you to the better quality rigs.