I am in the process of deciding on purchasing a Swarovski STS 65 25-50 vs a Swarovski STS 80 25-50. I am planning on using it for spotting at the range and for general spotting use. Is the STS 80 really worth the extra cost and increased light capacity? I don't have a problem with the extra cost if it worth it. Is the clarity/light on the 80 that much better and would this be a better option for my planned use verses the benefit of having a smaller and lighter STS 65 scope?