Good Rifle Scope?
How much money do you want to spend?
You answered your own question.
Nikon and Leupold are good rifle scopes.
IMHO across their lines Nikon gives you the best value for the dollar spent. If you want to spend $1000-$1500 there are some fantastic optics out there; Nightforce being at the top of the list.
GOOD LUCK and GOOD SHOOTING!!!