I'm with Peter... If you plan on baking regularly, a scale is the way to go, and they're not terribly expensive. Not all cups are created equal, but a gram is a gram is a gram. Plus, if you ever decide you want to scale your recipe by, say 20% (as I did recently), cups and spoons are just a recipe for madness.
If you do get a scale, I suggest one with 1 gram precision. The one I have now is only precise to 5 grams, and while I've used it for a few years now OK, I'm thinking of replacing it with a more precise one. The forum won't let me post links yet, but if you search Amazon for B001N07KUE, you'll find the one I've got my eye on - 11 LB capacity, 1 gram precision, and only $25... sounds perfect to me.