What kind of money do You want to spend ?

Your best option is to come out to one of the precision rifle match's and see what people are running and look through some different scopes .

The scope number 1 has to track right repeatably and every thing else is a bonus . Magnification is a big personal preference deal but as a general rule for 1 - 2 moa targets on a rifle used in the field 12 - 17 power is the range that is typically used on a 1K yd gun .

Spend as much as You can on glass , usually more than the rifle , if you can't see it you can't hit it .