One thing I forgot to mention is that I am going to be taking action shots quite frequently. A good friend of mine mountain bikes, and I am going to be taking pictures of him (for sponsors and whatnot). I am fairly serious about photography, and I wouldn't mind taking the time to learn how to use a DSLR to it's full potential.

From what I understand, the body of the camera (for DSLR's) is not nearly as important as the lens. So you will be keeping the lens for longer and investing more in them. Correct?