Best olive oils, Italy, especially if you buy single estate oils. Some of the best of Italy comes from Umbria. Try an "unfiltered" fresh harvest oil. That is what REAL olive oil is supposed to taste like. No light oils, no prostititions from Turkey, Lebonon, etc if you want the best. The purest oils are those that are "drip processed", not pressed at all, the oil just drips out of the olives after a rough chopping!
The saying is: do not worry about storage as you should consume a quart of oil in a month or less.