This is a belated answer for you, bhnyc, but I recommend Mollie Katzen's Racheli's Deluxe Challah from Still Life with Menu. Many libraries carry that book, so you may be able to test the recipe without first buying the book. She lists raisins as optional. I have made it with and without raisins, and both versions are so wonderful. I often make a small braid right on top of a large braid, and bake it in a little bit cooler oven than she calls for, and it comes out so shiny, and huge, and dramatic and DELICIOUS that I never fail to get gasps from people when they see it. And then, when we start eating it, everyone has more than one slice, or even several slices. It is very easy to make, too. I hardly knead it at all, and it can go in the fridge after the first rising and be held there, if covered well, for a few days with no ill effects. I have made this bread several times a year for many years now. Just fabulous.