You'll probably have better luck selling the Selectros and good knuckle, other parts separately, IMO. I wouldn't want to pay shipping for a broken knuckle, personally. The Selectros will probably bring close to what you would get for the whole thing as it is right now.
Well, I paid $325 for a complete axle that had the mini disc swap done to it. I don't know much about he selectro hubs as far as if they are as good or better than the aisan ones. And like thorvald said, I wouldn't want to pay for shipping a busted knuckle.