Interesting thread . . .
EXVISOR13, i have a couple of ideas for you that might help. I completely hear you. My girlfriend is ready to get a ray herself. Here's our plan:
It will still be a while (maybe a year), but the first people I will call is the Denver aquarium. We have been there before and they have some beautiful rays. Most professional aquariums will actually be very helpful. That way we know what the professionals do, and I think that can prepare my girlfriend and I a little better. Plus we will get to talk to an actual marine biologist (which is what my girlfriend is in school for anyways). And the other thing we will do is START with a smaller tank. As he grows we will upgrade. May start with a 125.
That is what I am going to do with my Bala sharks too (they can get to 12 inches).
Don't know where I found it, but there is a guy who has his aquarium all over the net. It's a 500+ gallon aquarium with several stingrays in it. It's pretty cool.
Try going to aquaticpredators.com. It's a forum like this and there should be several stingray owners there.
Good luck and definately reports to us how it goes.