ChefPeon, I LOVE LOVE LOVE your website!
As for Challah (which I make regularly) I have never used butter in it.
Depending on who's eating, I'll use one of the two below:
2 eggs at room temperature,
1-1/2 cups water
1/4 cup Olive Oil extra virgin
2 Tbs. Sugar (granulated)
2 tsp. salt
2 cups whole wheat flour
2-1/2 cups bread flour
1-1/2 tsp instant yeast
Poppy seeds
OR
6 oz sugar (granulated)
1 oz salt
4 oz olive oil
12 oz egg yolks
2 cups water
4oz fresh yeast
4lbs - 5lbs hi gluten flour depending on the flour used
(Although I'm Australian and user of the Metric system, when using American recipes, as I weigh everything out I just press the button and convert to the American system so the change doesn't do my head in).