I normally keep some of the osmanthus tea from Ten Ren around, for the occasional time when I or a guest might want a flavoured tea. It's delicate and pleasant and fairly well-balanced, and it doesn't cost a lot. I like it more than the osmanthus tea from Upton's or any of the ones I have found at the Chinatown shops.
But then.... a short while ago I was in San Francisco and I bought some of the Imperial Tea Court "Osmanthus Dragon Well." It's clearly starting out with a higher grade a of tea to begin with, and the tea notes make it nicely through the osmanthus even though the scenting is a lot stronger. I don't think I have ever drunk a scented tea and gone "Oh, Wow" before, but this has happened now.
--scott