Interesting... Dude, you've got a great voice. I actually preferred the auto-tuned version, as it matched the "synth"-sound of the rest of the song. I love the synths. Whoever said they're soul-less doesn't know a whit about music. I like those synths a lot. Yeah... I listened to mixes 1 and 4. I liked the overall tone of mix 4 better, but I like the vocal placement of mix 1. I don't like the panned main vocals at all. I think those should be very close, if not right on dead center, the ambient vocals need to be dripping in reverb and auto-tuned to death. Sort of like .... ya can't quite understand what they're saying, but when the main vocals come in, it becomes obvious. This way, they'd have their own space, and wouldn't muddle up the main vocals. ...and dude.. Did I mention that you can sing? Your pitch is off in a few areas, but man - the texture is just awesome. With a few lessons, you could really have something unique there.
Anyway... Great time with this one, man. Good message, too. Keep it up. If you want some alternate drums (I have a few ideas), let me know and I'll see if I can work some in here and there.