I was hoping to get some help deciding on a rifle scope for my 243 Chassis Rifle. I am an experience shooter / reloader, but new to Long Range shooting. I want to spend enough, so I don't have to upgrade in a year. My main hunting application for this rifle will be Prairie Dogs. I have been reading about the Nightforce NXS, the Leupold Mark V, and the Swarovski Z5. Should I spend that much? Should I spend more? Thanks for the help.