The answer for me is so beyond easy that it's actually quite sad. That Emin-bloody-em's "Lose Yourself" is the best is not that sad - it's very brilliant - but I don't like Eminem and when I'm more excited for his song than for those by people like Melissa Etheridge or Bob Dylan then that's strange to me. And how can the Academy be so smart as to award "Lose Yourself" and then turn around a few years later and give the statue to "It's Hard Out Here for a Pimp". "That's what the kids call 'hip-hop', isn't it? I'll vote for that. It's so exotic!" Yikes.
I have a feeling I know what will come out tops from this poll, and while I like "Falling Slowly" a lot I can confess in total honesty that I have not even thought about Once for a single second since the night it won the Oscar until right now when I had the impulse to do this poll. It was the one song I couldn't even remember when I was trying to think of what the ten songs were. Oops.