What part of Alaska do you live in? If in the coastal areas, you can probably get away with the breeds you have left on your list -- I totally agree that Leghorns won't cut it up there. Not only are their combs much too big, their body size is small and won't hold heat as well as larger birds (in extreme cold climates, larger-bodied animals have a smaller percentage of surface area to lose heat from, relative to their mass).
I grew up in Delta Junction, and have also lived several years in Tok, and had chickens there (as well as dairy goats). If you are in the Interior, my advice would be to drop ALL of the breeds you have on your list except the EE's, and replace them with either Buckeyes, Wyandottes, Rose-comb Rhode Islands, or Chanteclers. Anything with a small comb -- even in the rooster. Most of the breeds you have on your list, the hens don't have huge combs but the roosters do have large combs (look at the roosters someone posted pictures of above). It won't kill them to lose part of their comb and wattles, but it isn't good for them, either -- and they lose fertility while they recover. It's better to just get chickens that are adapted to the climate in the first place. I don't recommend Brahmas, however, as their feathered feet collect manure and ice in the winter. The breeds I mentioned are all reasonably decent layers, even in the winter; have small combs; large body size; make a decent carcass when they are done laying or if you hatch out some surplus roosters; and at least the Buckeyes will sometimes go broody. I've had EE's go broody, also, but that seems to be more of an exception rather than the rule.
If the place you are ordering from doesn't have good breeds for Alaska winters, I'd order from someplace else -- split the order with someone if you don't want 25 chicks and can't order fewer. Or fill the order with a few meat birds that you can put in the freezer after a couple of months growing them out. If you've never butchered anything, you should be able to find someone handy who knows how and can show you.
I once ordered chicks by mail while we were living in Tok -- it was early March and thirty below. The guy driving the mail truck down from Fairbanks (200 miles) kept the box of chicks in the cab of the truck with him -- I'm sure the cheeping had to have gotten annoying! But they did fine!
Kathleen