Best plants to grow (other next mint) for herbal tea? And how should I prepare them?

Best plants to grow for herbal tea other then mint? I hold mint already but I am looking at what else I can grow and cultivate for culinary purposes. I saw chamomile yesterday but I am not a big fan of chamomile. I own several types of lavender and lemon balm growing.
Also with the different leaves, flowers etc, which is the best process to prepare them? (ie: dried leaves, fresh flowers, crushed to powder etc)
I live in England and can plant outside and I also enjoy southern and eastern facing windowsills.
I am a coffee drinker but with summer approaching I be thinking iced teas would be nice and when it turns cool I can make hot teas near my summer crop. Thank you!

Answers:    This company has a deeply comprehensive site and their catalogue have good information bank of what is grown for which purpose. They specialize in herb and I've been dealing next to them for over 40 yrs.

http://www.richters.com

The Muse
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