for #4, if you want a strong DOF open up your aperture and focus in on that writing and put the car out of focus more.
As for #3, you're not completely center with the car (you can see that the mirror and rear taillight doesn't match up...just alittle deceiving on the eye
#2, Open up that aperture and put the BG out of focus, too much going on
#1 I love the shot, just too much angle.
BTW - Use Flickr, photobucket kills the resolution.