How does this sound, you've all got three days to get your voice recording (14th Jan, midnight British time) together and make sure you've clearly linked to it in this thread.
Then everyone has an allocation of ten points that they can give to whoever they want, (voting to close 16th Jan, midnight British time) all ten to one person if that's how you want it, three to one person, five to another, however you want to distribute your points, then whoever's got the most points is the winner. It'd be brilliant if people awarded it to who they thought gave the best performance rather than to their best mate ;-)
Anyone who wants to give it a go in the chat room fling the time up you're going to be singing and I'm sure there'll be an audience of some sort to heckle/throw roses ;-)
This may be open to change if anyone comes up with a better idea of how to organise it.