We like the big UK brands like Yorkshire (the British know tea), but of the main US brands, usually grab Bigelo. But any tea drinker has a cabinet full of all kinds of tea.
I usually look for well reviewed, reasonably priced loose Darjeeling of whatever brand I can find when I want black tea. But mostly I mix teas and flower petals of various types depending on my mood. Lavender, chamomile, calendula, rose, etc.
I hit up all the tea places I could walk to last time I was in Seattle but unfortunately Ballard was a bit too far from where I was, I'll have to keep them in mind!
Newman's Own black tea, 100 ct. The 100ct is about the same price as a 20ct from name brands. The bags are wrapped in paper, not plastic. And 100% of profits go to charity
Edit: and it tastes better than other brands that sell 100ct like red rose or lipton