The incomparably charitable HiFiman team are happy to let you, their customer, bear the burden of designing, tooling, and footing all R&D bills for their next amp module. In return for giving away the know-how potentially worth hundreds of thousands of dollars, you can have one of their spiffy headphones! If your blood, sweat, and tears win!

1st 1 HE560
2nd 2 RE600
3rd 3 RE400

Appetite whetted? Head to Head-fi's front page! Or this thread! Then shoot them a PM about a bridge; they've got one going for real fucking cheap.

NOTE: the post has been removed from Headfi's front page.