Ahem.
New Coke was a known bad transition. Why would I say that? All you need do is to look on a Coke can ingredients list from before New Coke and after New Coke. There will be one change:
High Fructose Corn Syrup.
Or if you wish to try the classic formula, try the Mexican version of Coca Cola. They still use the old formula using cane sugar. There is also a Kosher version of Coca Cola that uses the older recipe.