I am wanting a "Budget" spotting scope, would like to stay under 500.00 and would love to stay in the 250 - 300.00 range. I want to use it to see wind conditions while shooting mid range f class. I don't need to see bullet holes and all that stuff, just mainly mirage between me and 600 yds. I have good glass on my rifles (NF) x2 so I do know what good glass is. I just don't want to spend a bunch right now. What powers and objective size do I need and of course any brand names would be helpful. Thanks