Average cost of attendance may not be helpful for your family. If average CoA works for your budget but you will actually be required to pay more than the average, that school may not work. And on the flip side, if average CoA is above your comfort level but you would be required to pay less than the average, you may take a school off you list that should stay on it. You want to determine your EFC to give you a better idea where you will be (though many schools do not meet all need).
To me, graduation rate will only take you so far. Once it gets high enough, its largely on the kid. If a school has a 99% graduation rate, there are still kids there who do not graduate. Your kid could be one of them.
I would look at your kid and fit at given schools. LACs can have very different characters/feels. What appeals to one kid will not appeal to all. Visit some different schools and see what appeals to your kid. For some kids its easier than for others (in that some kids will fall in love with a given school (hopefully they get in) but others will be more neutral to all of them). Its tough at 18 to know what you want.