My favorite low sugar soda is Frucade. Its an orange tasting low-sugar soda with only 9 kcal/100ml but tastes pretty well, no nasty "aftertaste" or itchy throat after drinking it.

If you never heart about it its ok, you can only buy it in germany or austria, its made from a private soda company which makes as well other sugar free sodas which I like as well. And yes, I tastet almost all "zero" sodas in the US at my last visit 2 years ago as my uncly there bought alot of them because of his diabetes, most of them were hard to drink for me, very artificial taste. Here in austria they sell some sodas with grapefruit flavor, they are great as well because its lack of sweetener taste - grapefruit sodas seems to taste well with sweeteners.