I like the angle in 1 too - there's enough of a visible slope for the eye to accept the angle. Think this is the best shot
Don't like 2 - too much happening for such a close crop
3 is one extra flash away from awesomeness (as per Teshi's comment)
4 is great - like the wheels being turned in - be tempted to pump up the blacks/ contrast a bit more which would mean blue/blue would work better and enhance the metallic finish
The extra one is good too, but looks a little flat if compared to the others, but works on its own