We had noticed that "hanging out together" thing with some of our birds too, and I always wondered if I was imagining things...our Silver Spangled Hamburgs used to do that (probably not the brightest breed, but definitely FAST).
Have fun choosing! We're also from the north and chose sturdy gals who can take an uninsulated coop. Recently we got BR, GLW, SLW, BA, NHR, and one white leghorn. Also have older gals, including Anconas, BO and a crabby white mystery chicken. The BO is 6-7 yrs old and still laying sometimes!
Thankfully, my DH adjusted nicely to our sudden plan this summer to keep going with chickens.