I may be accused of being a shill the amount of times I have recommended the Vortex Viper 2-7X32. It's been on closeout for a while (they are changing their lineup) but is available for about 50% of list, about $169, which is about $20 less than the Vortex Diamondback 3-9 (also a good scope) although the glass quality is definitely a step up. It's also a great size for the type of rifle you describe. I got one before they went on sale and am tempted to pick up another before they are all gone.

For the price, nothing comes close. Also one of the best warranties in the business.

SWFA has them here.