What is it for? If you need a firm cake for structure then icing which will keep OK then Madeira, I just did an iglu for a birthday from Mrs Beeton's madeira recipe but used orange zest, this was nicer than the dairy diary all butter song recipe (did a practice run a few weeks ago)
If you want the simplest cake mix then same-of-everything-half-as-many-eggs all in one is OK (imperial measures i.e. 4oz to 2eggs etc).
What flavour do you like? White cake can be citrus zest, vanilla, almond, all sorts really!