Just for posterity's sake, here is my favorite pizza sauce. I don't remember where I got the recipe, but seeing as its one of those "a dash of this and a smidge of that" recipes, I'm not too worried about copyright infringement.
In your blender combine:
1 can of tomatoes (whole, drained)
1-2 cloves garlic
1-ish tablespoon balsamic vinegar
1-2 tablespoons olive oil
Blend until completely incorporated. I usually use about half for my pizza and then freeze the other half to use later.