What to Buy for a Guy???

You'd think after nearly four years of marriage I'd have the whole "what should I buy for my husband?" thing all figured out. But do I? No, not really. There are so many things he might like, but what if he doesn't really like them? He's always gracious about gifts, but I've seen gifts he's been given just sit in our room and they never get touched. Or he's exchanged a gift without the giver ever knowing. The thing is, he can't do that with what I give him. I know he'd love a playstation 3. Or does he want a Wii or an X-Box? See...when it comes to something I know nothing about, like video games, I just don't know. Sure, I know he likes them, but which one does he like???