Im looking into getting a new optic for my ar. The one I have now is a target sports tactical. Im just not happy with it. Seems its just hard to setup. I want something that can be used close quarters and long range out to about 600 yards. Im thinking about nikons prostaff and millets dms scope. Something in the $200 to $300 range budget is a concern. Any thoughts on a good scope for this application. Thanks for any input.