I have very large plastic dog crates with straw in them and the hens seem to like them. Of course one uses a stall in the barn - she likes lots of space.
I highly suggest the Hovabator Genesis 1588 to anyone looking to start. The cost is reasonable, the controls are easy to understand and use and the plastic tray in the bottom make clean up so much easier.
I have 3 different incubators, one being the HovaBator Genesis 1588, one a Farm Innovations Pro Series and one a less expensive circulated air non digital one. I want a cabinet one but have to wait. By the end of this hatching season I hope to be able to afford one.