It's funny--before I was diagnosed with diabetes, I loved Pepsi and didn't really like Coke as much. Since then, I only drink diet, and I love Diet Coke and I don't care as much for Diet Pepsi. Of the Diet Pepsi products, I do like the Diet Wild Cherry, but I can't find it in many places.
I love rootbeer, especially Diet A&W. Someone mentioned Stewart's. I know you can get it in bottles at Cracker Barrel.
I have always loved cream soda, but it is hard to find around here in diet. I love Diet Squirt now and then.
Mostly I drink iced tea (prefer it with sugar but drink it with store brand Splenda) or water, but I do enjoy pop once in awhile. It is a must when eating pizza!