What's the best gift for my designer / developer employees?

I love everything about the holidays except for trying to figure out the perfect gift for friends, family and especially employees. So, if you're a designer and/or developer, please let me know which of these gifts you would like the best... A. SOL Republic Headphones B. Tickets to a trade conference C. Amazon gift card (of equal or greater value to everything else) - boring to me D. Gift certificate for software (of equal or greater value to everything else) - also, boring to me E. Subscription to some online training / learning course (eg. Treehouse, Code Academy, etc) F. Music subscription (eg. Rdio or Spotify) G. Other (if other, suggestions would be awesome) Any and all help is extremely appreciated. And I hope your boss is getting you something cool because I'm sure you deserve it.