Victoria is one of my favorite store-bought pasta sauces as far as flavor goes. Their marinara is about 70 calories per half-cup serving and no added sugar.
Cucina Antica sauces come in at the best calorie count for any store-bought sauce I've yet to try- and amazing flavor! Their garlic marinara and tomato basil flavors clock in at 45 calories per half-cup serving... You can have a whole cup of this for less than most other brands!
Their vodka sauce comes in at 65 calories per half cup serving as well, about 40% less than others.
Muir Glen is an awesome organic option that also doesn't have any added sugars.