Flat top, I presume. I should think a quality variable power scope, at least 3-9 x 40, or 4-12 x 40 should cover the ranges you mentioned.
Buy quality. I used to work for Leupold and I'm biased toward them, but there are many quality scopes on the market.
Don't go cheap though, you get what you pay for. It's been a few years since I was there, but their VX-2 models were around $200. They have much more to choose from these days and I'm certain their prices have increased.
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