Currently have nikon monarch "x" 10.5 x 45, chinese glass, probably 10 years old. It's the best glass I've owned, I've only had other lower end nikon and bushnell's in the sub $200 range before that. I'm thinking about upgrading. They are old enough and the "x " in the name make research of comparisons pretty difficult on a web search. I know the buy once cry once mantra but top tier glass isn't doable right now. Primary use is whitetail In The woods but will be used for occasional western mule deer and elk hunt in the future. Budget is Definitely sub $1000, prefer to be lower than that. New or used. What would be a noticable upgrade in that range?