Leupold long range duplex varmint. If you shoot long range regularly, the Nikon bullet drop compensator looks like the TICKET although I haven't forked out the cash to try one yet. And if you're on a budget, I've heard good things about the Tasco Varmint scope. I have a World Class that pound for pound is a great scope and is way less $$. The optics aren't quite as good but you almost have to be a scope afficianado to tell the difference under most shooting conditions.