We've had RIR's, Silkies, "mutts", Marans and guinea fowl recently. Our neighbors have at least a dozen breeds. Neither of us have had any problems with cold here in central NH. Our chickens usually prefer being outside even on bitter nights.
The Marans were our favorites until they were killed by a neighbor's dog. Mostly because we take a childish pleasure in collecting those big, dark, dark eggs. (I'd like to try Ameraucanas one of these days, too.) They were also the tamest, and they foraged well for themselves. The Silkies have sweet temperaments also. Nothing wrong with the RIR's except that they're just... boring and common. They're the best layers, but that's not important to us - we get more eggs than we need from even the Silkies.