I had good luck colony breeding cockatiels but have no experience with the others. A fellow breeder said his female ringnecks were incredibly aggressive when put in with multiple males, to the point of killing several, so take what you will of that. I have no experience breeding ringnecks so I can't say for myself.
I started with a flock of around 45 in a large walk-in aviary. Out of the 45 birds, there were around 18 breeding pairs. The rest were older hens and males that had paired up together. There were a lot of chicks each year, but it also a lot of work to feed and clean daily. Today, the aviary is gone and I'm down to 12 cockatiels in 3 cages. I've had 4 chicks this year, and the plan is for the rest to be gone by the end of the summer.