Those are the only picture I have left. I needed room on the computer for work stuff. I think rays are easier to care for in the long run due to the fact that they dont need as much space as sharks on the average. The do stir up the sand quite a bit, but I looked at it as a good thing. Most of us cant say that they can take a handful of sand from the bottom of the tank, turn it over and not have some kind of cloud or debris in there. The rays were constantly turning the sandbed over not allowing the nitrates to become trapped in there. It makes larger water changes a must, but there is no potential for a spike.
As far as you keeping one, not to REALLY sound like a total jerk, but they are a very demanding animal and take a lot of experience and research. Just wanting one doesnt count as research either. I spent many many nights and weekends reading books, searching zoological sites and speaking to the local public aquarium before I even decided if I could truly care for one. I think that you need to sucessfully care for a few tanks before you attempt this project.