If you get any of the "throwback" sodas with real sugar, get them in glass bottles - if available. That's even better.
I don't drink too many sodas but when I do, I get a local soda that is made with real sugar - but it only comes in the glass bottles. The can version uses corn syrup sweetener. It's not as good.
I wish they would make the 6 or 8oz bottles available again too. 12 oz is too much. I just want a quick taste, not get loaded down.
Speaking of Mountain Dew...that was my favorite as a kid. It was so cool to go into the general store and get that green bottled sweet soda out of the icebox. Remember the little mountain man that was on the bottles way back when?