Below is Hitachi's line of carpentry drills. You won't find a better design. Not only are they rugged, but they just feel good in your hand.
If you plan on ever drilling into concrete, consider Hitachi's line of hammer drills (see link at left <== ). There's no comparison between drilling concrete with a carpentry drill, versus with a hammer drill. Because hammer drills have become so popular, most models permit you to turn-Off the hammer for carpentry use. You get the best of both worlds.