I have a pair of viper 10x42's and absolutely love them but a lot of my stands I can see upward most of 250yds and they just dont cut it at early and late hours as far as the zoom goes being able to tell rack characteristics. Would it be worth going with a 15x. I feel it would benefit me a lot. Thanks. Also what brands, trying to keep a budget under 500, but will be looking at used as well.