D90 or D300?

When I was in college, I was one of the few carrying around an SLR camera as an official photographer of our school yearbook. During med school, I buried my nose on textbooks and forgot about photography. Then I found the camera to be sickly, after years of not being used. A friend said if I were given a good camera, I could make miracles out of it.

When I finally bought a D40, things were much different. I have a lot to catch up in matters of digital photography. Because of this, I decided to sign up for an upcoming workshop. I will be needing the skills for blogging, makeup, and simply to re-ignite my abandoned passion.

Now reading some forums, I am confused. Should I buy a new lens of get a D90 body? Or should I save up more bucks for a Nikon D300s? Oh, and the video feature of Canon 550D looks tempting too! Universe, could you make it a lot more easier for me by giving me the means to have the best choice among these?