I really enjoy the Techno and the 2nd version although I feel they should be used for different tracks.
The 2nd version should be the final cut, and the techno version perhaps use it for a Zero-G version of Badspot Motorway as the music style fits that theme.
As for the two cuts of the old version I like them as well, but they're missing a bit of something. Perhaps a more defined beat? Or maybe another instrument. Either way, that version still needs some polishing.
Edit: Well, Kingdaro's version was nice, but I worry about how it would loop. It also need more progression. Once the song peaks it doesn't really change. Might get boring or stale before the race ends.