Are those cochins LF or Bantam. Most Cochins have to go through a laying cycle, sometimes 2 before they will become broody. Once they do, they are determined.
There are a lot of incubators out there, it depends on just how much you are willing to spend. If you think you are going to do this on a regular basics it pays to buy one that is more expensive. Remember that you generally get what you pay for. The difference is that more expensive ones have more automatic feathers & generally hatch better with less attention.
When I bought them I was told they were giant white. 2 are pretty decent sized birds, but one is smaller. I wouldn't say bantam but I don't really know. I have only had chickens since May last year, and have so very much more to learn! I think I want one with a turner since in the winter I am often away from the farm being transportation for my human kiddos.
