I use Cattleman's Smoky as my basic sauce. To me it is about the right amount of tang and sweet for most things right out of the Bottle. Costco here now sells it in a pack of two half gallons, so they fit in the refer door. I sometimes add a little molasses.
On the next self up I have a bottle of Sweet Baby Rays which is sweeter and in my case I am more into sweet than heat.
Over time I have found that time and money wise you can't build your own for the money, just doctor up off the shelf if desired. But especially with pulled pork, I'm beginning to believe that a little dab will do you, if you do your pork right.