I'd look at the Burris Fullfield E1 6.5-20. It retails for around $450, has good optics, weighs 19 ounces, and you can either crank it up or down or use one of Burris's ballistic reticles. The only disadvantage is it has an adjustable objective, rather than side-focus.

Another would be the Vortex Viper 6.5-20x50. It's a 30mm scope so is two ounces heavier, but has side-focus. Real-world price is about the same.

“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.”
John Steinbeck