Quite a few years ago, I found the freshest, cleanest scent like ocean air and fell in love with it. I can't recall the name of it, it came in a small, round, etched-glass blue bottle. Of course (grrrr), it was discontinued (something that seems to happen frequently with favorites, such as really well-fitting bras, but that's a whole other tale of woe).
In summer, I like the old stand-by, Dior's Eau Fraîche. I keep a bottle in the fridge at home, another in the office fridge.