I'd think any of the breeds you mentioned would work fine for your criteria. The only one you mentioned I have is the Delaware and I really like them. The Speckled Sussex also seems to meet you criteria well from my experience. I'd suggest you stay away from the Orpington and Cochin for two reasons. One, they go broody a lot, and two, they have such thick feathers that you may need to do some vent trimming to help fertility since you plan on hatching your eggs. Both go against your "easy to manage" criteria. (You can do a search on vent trimming on this forum if you are not familiar with that). They have a reputation for not being exceptionally friendly, but I'd suggest you also look at the Wyandotte. Good luck. It is hard to choose unwisely.