I would add a couple hundred more to your budget and get a new Nightforce NXS 5.5~22. Or buy a used one for $1400 to $1500. You will not out grow it for a long time, you will have all the options you need for the job along with the 100 moa of elevation. Plus if you ever decide to sell it it will sell quickly and the loss will be minute. There is a reason they are the best selling long range scope.
Jeff