Long story short I came into a small amount of money and am wondering if I should indulge my longstanding desire to get a professional level camera (D4, or one of the others). I am NOT a professional. I am a hobbyist who derives a great deal of pleasure from photography. My main subjects are sports photography and dogs and other animals.
I currently shoot with the D300 and like it pretty well.
If I were to get a professional level camera, what differences would I see? Is it worth the (rather extremely high) price tag?