Hi, I am still a newbie when it comes to optics, as well as birding in general, but I'm looking to upgrade from my $50 binoculars to something more quality and am willing to spend up to $500. Though, I am leaning towards purchasing the Nikon 5 Monarchs, I am wondering if anyone can direct me to some other good selections for that price range. I am willing to buy used binoculars, as-well. Thanks.