If you really want to get the most out of your rifle, it is not unheard of to spend more on the scope than the rifle. To get the best out of your rifle a Ziess Conquest would be good--around $350, or a Burris Signature--range from $400-600, a Nikon Monarch. The quality of the lenses and the coating is worth every penny. My preferred choice of optics is a Leupold Mark IV Tactical or a Gen III
Springfield, spend the money on a good scope, it will be worth it.