THose were taken with my D50 and 3 speedlight On SB-800 on camera and another 800 off cam along with a 600 off cam.
The red civic is the best composed photo of the bunch imo. They all look great You could do some editing as well and darken the bright wall behind it and perhaps even the ground some. That would certainly make the car and the color POP out at you
yes speed lights are nice, keep in mind I was using 3 on the S2000 and one more wouldnt of hurt to have. I really need to step up and pick up a D200 or D300 and get my other 800 off the cameraor break down and by some pocketwizards.