What Should I buy?

I have been asked this questions many times through out the years. I refuse to give a answer of "nikon, canon". There are several factors of picking a camera. It comes down to preference and what you will be doing with your camera.  We all have a budget and a good idea of what we want the camera to do. I have have worked with  film nikon cameras and that has been years ago. I do work with Canon Digitals and I can only give you a recommendation on the products that I use.  I would recommend taking the camera you currently have and working on getting more educated about photography in itself.  While learning what all that stuff means ~ie, fstops, aperature, ISO, etc etc.. work on your composition. Its what I tell people the most. Learn how to tell the story in your photographs. Learn how to pose men and women, families and children. Learn how to lead the eye in and out of a photograph. One of the first tutorials I ever read was Jzeltsman. His feet up approach is what my posing foundation is based on. Here is a bit of information I fould that may help you along the way.
http://super.nova.org/DPR/Technique/ZZ.html
 There are many online forums to join that you can get good help. Join a few and practice, practice. Soon you will be finding out what kind of camera you will want the most and it will train your mind to think when you use your camera.