Hi, We live in Northern Illinois with similar winters. This is the first year with chickens. We have two Buff Orpintons, two Black Astralorps, one Rhode Island Red, two silkies, two Easter Eggers, one Brown Leghorn, three small cochins, and two large cochins.
We keep them all in a very sturdy coop in the winter and only very rarely turned on a red light, like the ones you use in a brooder to give just a bit of extra heat. The problems we encountered last winter was frostbite on the tips of our rooster's comb that is a small cochin. The Brown Leghorn and one of the Buffs also had a bit of frostbite on their combs. A few others looked like they were on the verge of a problem.
Many posts on the forum said to put vaseline on the larger combs in really cold weather. Well, easier said then done. Then they put their heads in their side or under someone else and the vaseline comes off. So even with our best efforts, some of their tips froze.
So I guess to sum up for winter concerns, we had the best luck and less worry with breeds with really small combs, such as the female cochins and the Easter Eggers (they also lay colored eggs which is really fun). The silkies did really well, but some feel they have a harder time staying warm in the winter. Ours were fine since they always snuggle under a bigger chicken
As far as temperament in our group, the Buffs, Easter Eggers, and small cochins are the friendliest and love to be on your lap. The worst one for temperament is the Brown Leghorn. She doesn't want to be touched, but she lays wonderful eggs. I think just like people though, even the same breed will have different personalities.
Good luck, there are so many choices!