Sean, can you not drink caffeinated drinks any more? Simple question, what are you looking for in your tea? Are there certain health benefits you're drinking herbal tea vs tea leaves?
My taste is towards tea leaves, specifically green and white tea. So I'm just going to give you some examples of really beneficial teas
I really like white tea for its low level of caffeine and high level of antioxidant.
If you're looking to maximize health benefit in a cup, you might want to try Metcha Green tea (that is in powdered form)
I've tried Metcha once a number of years ago and it's a hard taste for me to acquire. It is also very expensive, so I am less motivated to acquire the taste. lol. White tea is the second expensive after Mecha. The leaves are picked when they are still buds with soft silvery hair. This is why it's called white tea
This site gives you pretty good information on tea:
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