I'm not a big fan of commercial sauces, but recently found that SBR makes a few varieties, and our local grocery store (Giant) had them on sale. There's one called "sweet & spicy" you might like. If you like really sweet, there's a "Cola Q", but my favorite is the "Hawaiian Style", but it falls more into the tangy category with a bit of pucker from pineapple juice.
But, when I started making ribs back on my old offset, I'd mix up something new each time. I'd rub them a couple days ahead and use the liquid they left behind as a base. Mix it up with a can of Coke, root beer, or Dr. Pepper, bring to a boil and start throwing in some other flavors to get to where I wanted it. Often a bit of brown sugar, some paprika, granulated garlic, and some lemon or lime juice. I really should have been writing stuff down 'cause a few times it came out really awesome. But it was kind of fun and exciting to try different things all the time.