Halycon's - Cran Ch'i & Dragon Ch'i
I rotate between those two all day everyday, have been for about a month and don't foresee changing anytime soon. Also, FYI, the Ch'i is short for lychee as opposed to the tea.
They're fruity and refreshing & not too overbearing or overly strong in flavor but in my opinion (& everyone I have recommended it to so far) just exceptional flavors. Never thought of myself as a lychee fan but what can I say... they're just hands down my all time favorite at this point in the game.