As long as you get them young, mixing breeds isn't normally a problem. If you have a hen that goes broody, you can even put a couple day old chicks under her and, regardless of what breed they are, more often than not she'll raise them as her own! The biggest issue is when you try to add a grown chicken to a pre-existing flock. It's a lot like most animals where, if you try to introduce a new animal to the mix, they don't always accept it...or take a while to be okay around each other!
My first flock I started out with a day old Sussex, Wyandotte, Polish, and Belgian d'Anver. All of them got along just fine!
[COLOR=333333]Sex Links lay a high amount of large brown eggs. They're typically sweet, docile, and are cold and heat hardy.[/COLOR]
[COLOR=333333]Australorps lay a high amount of large light brown eggs. They're typically calm, friendly, hardy, are okay to free range, and are cold and heat hardy.[/COLOR]
[COLOR=333333]Plymouth Rocks lay a high amount of large brown eggs. They're typically gentle, hardy, are okay to free range, and are cold and heat hardy. [/COLOR]
[COLOR=333333]Speckled Sussex lay a high amount of large light brown eggs. They're typically friendly, are okay to forage, and are cold hardy.[/COLOR]
[COLOR=333333]Welsummers lay a medium amount of large dark brown eggs. They're typically active, friendly, are okay to forage/free range, occasionally go broody, and are heat hardy.[/COLOR]
[COLOR=333333]Wyandottes lay a high amount of large light brown eggs. They're typically easy-going, okay to forage, and are cold hardy.[/COLOR]
[COLOR=333333]All of the chickens that you're looking at are production or dual purpose birds, so you can't really go wrong there! I had a great experience with my Sussex and Wyandotte. Although Wyandottes don't always do well in confined spaces, so something that you might want to consider is how much room they'll have and whether foraging during the day is possible. In a lot of places there are too many predators to have a small flock outside of an enclosed run.[/COLOR]
[COLOR=333333]Good luck![/COLOR]