Which of these would be the best bet , Nikon Monarch 6x42, Sightron 6x42, Burris fullfield II 6x40, Cabelas Alaskan Guide 6x44, or Weaver 6x38? They are all comparably priced except for the Weaver, which is about $80.00 cheaper. It will be going on a little used Steyr Mountain Rifle in .260 cal. What do you guys think?