I would go for a retic. Make sure you have a big enough tank. Height isn't very important. I have 2 in a 6' x 3' tank. Having a sump is really helpful for putting in heaters and making sure that large volume of water has enough oxygen in it. Unless your tank is big enough I wouldn't put any decorations in it. Rays need the floor space to swim around and bury in the sand (Estes' sand was recommended to me). If the tank is big enough though, decorations make it look nicer and the rays will check them out (it was pretty amusing watching the little girl try to fit into a rock cave that was way smaller than her disc size).
I don't really see any reason to feed feeders at all. For one stingrays aren't particularily good at catching them. I was told that if you want to feed feeders you'd have to pinch the swim bladders on the fish, destroying it, so the fish would have to stay on the bottom where the stingray would be able to find it. Which is mean in my opinion and I was like ok no feeders for them. Anyways, they eat frozen bloodworms just fine and even eat meat pellets once they're soft enough to chew. When they get larger I'll feed them frozen fish.
Make sure you do lots of water changes. The most important thing about water chemistry is to keep it constant, even if it's a little hard and the pH is a little high. I have a similar setup to born2lovefish, hoses are connected to the bottom of the tank, I play with some valves, it drains into a drain, I play with some other valves, it fills up from the drums I have full of water (including heaters to keep it the right temp, and bubblers so it doesn't go stale). It makes doing water changes way easier and then you don't have to put your hands in the tank and risk getting stung.
I haven't had my rays very long so most of what I've said here is what I've read and gathered from other people.
www.aquaticpredators.com have a good stingray forum. Anyways stingrays are fun and if you can accomodate them than it's worth it. They develop quite the personality. The little girl likes to go to the top and gulp air and then swim back to the bottom, then let the bubbles go and try to catch them again as they float to the top. It's quite amusing to watch.