I have found my auratus to be out fairly often if I move in slow. If the humidity is low they hide and if I trim the plants in the tanks they will hind for 2 weeks or so. Still a very nice frog, I will always keep them. Call is quite.
Leucs would also be a very nice frog. Plus for them on thier call, very bird like.
I would stay away from azureus in groups because the females will fight and I have seen tincs act this way to. Most tincs like small food, like auratus and leucs, but they can eat a ton. Both will stay out in the open for the most part and you will be able to see them most of the time. Call is quite so slight deduction there.
Now if you want a very bold frog go with Phyllobates terribilis, or bicolor. Mine will hope across my hand to get food, I bet I could train them to eat out of my hand. Great beginner frogs and they will eat just about anything they can shove in their mouth. You can feed them small crickets if your fly cultures crash, too. It is nice safty feature for you until you get the fly cultures worked out.
Hope this helps,