I don't often drink pop anymore but when I do I go for a cherry vanilla Dr. Pepper from Sonic.
I also just had the chance to try Orange Coke and Raspberry coke at a Five Guys from their Coke Freestyle machines. It was very interesting to say the least!
Do you have any stores around you that sell retro brand glass bottle pops, Grooves? That's the only thing I keep stocked in my theater fridge. Many of them differ from "standard" coke or pepsi flavors and also use sweet sweet cane sugar. A real treat every time someone has one. They sell sampler 12 packs at a lot of places. Those are doubly fun because you never know which one you'll grab.