We have a big family, too! We wanted some friendly, quieter breeds, that would be fine for cold winters (we're in Minnesota). Here's what we got:
Australorp (they're black, with purple and green highlights in the sun!)
Buff Orpington (goldish (buff) very fluffy and cute!)
Plymouth Rock (Barred variety) (they look quite cool with their black and white bars)
We also got two Sex-Link strains (Black, and Gold), on the recommendation of the hatchery. Apparently they lay very well, and even lay through the winter! I'm not sure how nice they're supposed to be, but I don't think they're especially mean.
Maybe someone more experienced with Sex-Links can tell you more about them!
Have fun with your chicks!
They're absolutely adorable when they're little! They're not so bad when they're a little older, either!