I got a job working for a professional photography company, my first ever actually. I have used film cameras in my previous photography jobs, and my at home digital is not good enough for the new job. They are lending me a camera now, but I am in need of a "professional grade" camera. I was given no other specifications than that. What are some details I should look for in a professional grade camera? (dslr) Please help, I have no idea where to start.