I voted for graphics card since we can assume that every game-developer needs a good one.

Personally, I'd LOVE to win a new soundcard (We're talking Asus Xonar then, or similar LOL)

That said, I think hardware prizes are a bit more risky than for example, book prizes. Someone may allready have that uber-powerfull graphics card, while chances are slim that he owns "that paticular" book.

Network equipment is even more risky, because only people that have LAN's, CAN benefit here.

Hardware prizes I really like would be storage devices and joysticks/gamepads. These are handy and relatively inexpensive, so if the winner doesn't really need them, it's not a disaster.

And eeh.. That cyborg keyboard looks brutal.