I've always favored a low power scope, like a 1.5 X 5 for hunting deer where most shots were short to medium range. The 1.5 on the low end will give you a much larger sight picture at shorter range and make it a lot easier to stay on a moving target. In addition to their usefulness at longer ranges, they also have better light gathering capabilities. As long as you don't go over 5 or 6 power, you shouldn't need larger than a 30mm objective lens. The human eye can only gather light at 5.5mm (or so I've read) so, if you divide the objective lens size, 30mm, by the order of magnification, 5, it comes out to 6mm, which gives you plenty of light.
The only reason I tell you this is, I've known a lot of people who insist that you must buy the biggest objective lens you can get, which is usually not only not necessary but, more expensive.