Finally tired of fighting the camera and the far-too-often "out of focus" issues when an image is not accepted, I went ahead and ordered a Canon 7D (upgrading from a T2i.)
I can't believe how much better my images are turning out! And, I wondered why I had waited so long to make the move.
Camera equipment is an investment in your business (or hobby, as it is for so many people.) But having quality equipment will make all your efforts much more worthwhile. Imagine finding yourself in a once-in-a-lifetime photo opportunity and being unable to get a quality shot! Kinda like a hole-in-one with nobody to witness....
I'm so glad I upgraded!