Guys love to play with gadgets and gizmos of any sort. Even if a guy doesn't know what it does, he still checks it out. One of the biggest parts of your gift is your card. That's one you'll have to pick yourself. Every guy is different, so make sure to pick one that's good for him.
Jewelry is another good gift.
We don't exactly go for sapphire earrings, but we do like necklaces. If you don't want to hit the nearest Dillard's, you can always go for a hat store. Foot Locker would be a good prospect for anything from shirts to hats, and of course shoes. If you've got a car lover on your hands, get something for his car. The two fastest ways to a man's heart are through food, of course, and through his car.