If you're baking something sweet, I might go with the neufchatel option. For something savory you have lots of options. Laughing Cow makes some great low calorie spreadable cheeses (we're talking about 35 calories per wedge). You can find that with the other refridgerated cheeses, they come in many flavors too. Depending on what you're making you could also use a soft cheese like Brie, or a good gorganzola.