Dcpride, you never said what color your car was, some colors like black, white, and yellow respond better to touch up paint since they aren't metallic colors.
If your car has metallic paint (which every other color offered on the Crossfire is) then only have an entire panel painted as a last resort. Why? Because it's nearly impossible to match metallic paint, no matter how well it's done. Unless the exact air temp. humidity, paint mixture, and angle of the spray guns nozzle is duplicated, it won't be an exact match. And in certain types of light, or by looking at it from different angles, eventually you will see the difference.
Like Andrew pointed out, take your time, and apply the paint very lightly. If the scratch is down to bare metal, you should apply some primer first, then gradually build up your color by applying very light coats of paint. Try your best not to overlap the touch up paint onto the existing factory paint. After the paint dries, by using a wet, fine, polishing compound, you can gently rub the touched up area to make it even with the rest of the paint, and to help it blend in.
The whole key to the project is to take your time, and not be heavy handed.
Good Luck