Agree with Sweetfolly about ducks. Although a wonderful bird, hardy, healthy, not bothered by bad weather, friendly, and fun, they are nevertheless messy and live up to the "waterfowl" in their name. One or two ducks will drain a drinking water container in an hour that will serve a flock of 25 chickens for a day, and make a mess doing it. They are not the bird of choice if space is limited. Most recommendations call for 10 to 25 square feet of space per bird, and during the sloppy winter months I'd definitely shoot for at least 25. While it's true that they can be noisy, if you want a breed that isn't try muscovies. They are practically mute. If you have the space, there probably isn't a better small livestock species you can raise. They brood and hatch their own eggs quite successfully and can have 2 or even more broods a year, depending where you live (although the spring brood is usually the largest). Another drawback to ducks is the fact that unfortunately they are the most helpless poultry species when it comes to predators. Although ducks could theoretically feed themselves in the summer if they have access to pasture, they are also readily picked off by hawks. A good fence goes a long way to stopping things like dogs, but it's hard to prevent aerial attacks unless the birds are confined, and then there's the space issue again.
Also agree about Coturnix quail. Apart from the small size (which requires suitably sized drown-proof waterers and feeders) and the fact that you will need an incubator, they are one of the easiest birds to raise, a lot more so than the Bobwhite (which in my opinion can be rather difficult to raise, plus you need a game permit). Baby Coturnix are so cute, about the size of large bumblebees. One thing to be aware of, they are accomplished fliers within the first week of life and need to be housed in pens that they can't fly out of.