My vote is for the car that's actually turned a wheel - NAE. Despite all the difficulties they've encountered, I think their sheer determination, persistence, and their ability to actually keep this ball rolling will pay off.
Yes, the BSSC is a more advanced design, and has better backing, but what are the odds of them being able to pull it together and run any record speed without some actual testing anytime soon?
I've said this before - it's ironic that the fastest motorsport on earth is also the slowest. But one cannot discount the fact that the NAE team has an actual functioning vehicle and team in place. That's a huge advantage.
I'll step out on a limb and say this - I think the Eagle will likely set a new record before any of the other contenders, but I think it's also fair to say that the record will not stand very long. That would be a good thing for NAE - it will bring cash to the table, and THEN we'll have a REAL horse race.
And as long as I'm out here on this limb, the Cubs will make the first round off the playoffs as the NL Wild Card under Tony La Russa, the Yankees will be mathematically eliminated by September 15th, and we'll see the Twins in 5 over Philly in October, 2011.