Looking at them all and taken it for what it is, I'd go with #1
I think it is cool that it is at a drive in. Very nostalgic like. While ti is hard to tell what color it is exactly, I find it cool that you can't. The car looks wicked straight and clean. If it makes the contest, I'm sure the color balance will be corrected a bit. That is really the only downfall of the shot, the background being so white.
For people looking at this pic thinking how can I do a similar thing (taken pic of car with bright background when car is shaded), remember a fill flash will help tremendously. If this picture was taken with the flash forced on (most digital cameras have this option), the car would have come out looking green and the background would have been a tad bit darker, perhaps even picking up some detail.
Like everything, it is a learning process.
I'll be honest, a shot I haven't seen yet but would love to see on a calendar would be a silhouette shot of a Challenger/Cuda with a scenic sunset in the background. This type of shot would be killer but it would have to be done right so as you can tell what car it is. Never seen one done and would love to see it.
BTW, #3 is very nice too, but make sure you have it in a high res. file.
