Figured it was time I voted. I could have checked several. While I don't agree with any of the later theories, I do agree with several of the earlier ones. But the one I agree with the most is the ransom theory. It was the earliest and longest held, and Jesus says directly that He came to give His life a ransom for many. That's my reason for believing it and voting for it.
Who did he pay the debt to?
And how can there be a opayment made for sin, and have the sinner not benefit from it, as this theory would hold to?