I'm looking to buy a new scope for a custom tikka 7-08 that I have Jon Beanland building for me. The three I have narrowed down to are Schmidt and Bender 3-21 exos, Leica Magnus 3-16 and a Swarovski X5 3-18. This rifle will primarily be used for hunting whitetails and shooting steel on occasion. So low light ability and cutting the glare at those times are the main attributes I'm looking for along with being able to reach out touch one in the 5-600 hundred yard range. Also will be shooting steel out to a thousand. Which one of the three would be best?