I also did a lot of research before starting our flock. I have 11 Rhode Island Reds who are hardy in our cold Wisconsin winters. Like most others who have posted here, my chickens don't like the snow. They will eat the snow off of my boots when I'm working in the coop and collecting eggs, but they don't want to walk in it.
We have about 6 inches of straw on the floor of our coop and straw bales around the edges inside the coop to provide extra insulation. I have a heater base (sold at most feed stores) for my metal chicken watering "station" so their water never freezes.
I keep a thermometer in the coop (mostly for my own curiosity) and in general the coop stays around 20 degrees inside. I have had a few times where our temps outside were 10 to 15 BELOW zero with 30 below wind chills... and the coop inside dropped down to zero. The girls did fine, when I wiggled my fingers through their feathers their skin was warm. Granted I don't think they enjoyed that cold... but they did fine in it.
I have given them a few extra treats (even some live mealworms) to give them a break from the "same old same old".
My chickens generally free range and I open it up when we aren't going to have a lot of wind and the temperature is over 15 degrees.
The key to having chickens in the winter is:
1. Make sure they have sufficient shelter and protection from the wind and elements.
2. Make sure they have access to clean water and doesn't freeze.
3. Provide them with oyster shells if they're laying. (I do this all year round)
4. Choose a breed that is hardy in your climate.
Best of luck to you! There's an awful lot of great information on these boards and lots of people who are happy to answer questions and share their experiences. Happy Chicken-ing!