When I can't make up my mind on what cake to get, I usually just go with a Marble cake. Often times though I crave something other than the usual chocolate or vanilla cake. I love Carrot Cake any time of the year. For birthdays, I prefer something different like a Banana Walnut cake, with slices of banana between the layers of cake. Plus they add a lot of moisture too without any extra fat.
I'm not much of a fan of Angel Food cake, but I do like the simplicity of a Strawberry Shortcake, as long as it's fresh strawberries that have been mixed with sugar and allowed to soften naturally. A splash of strawberry or cherry liquor is also welcome.