Dragonwell is a nice take on green tea. It's easy to drink endlessly, and a good choice for your main drink.
Keemun is a subtle take on black tea. Good to have in the rotation when you've bored of breakfast tea.
Rose black tea is a great treat to rest with. I've found it hard to acquire lately.
Gyokuro is a super expensive green tea, impressive for special occasions.
Matcha powder is nice if you're in the mood, and looks great sprinkled on a coffee.
I tend to buy from Tea Makers of London.
Sadly, going to an upscale tea place in an urban area does not guarantee you decent tea, nor are places consistent. There are places that have nice blacks and greens, but utterly miserable rooibos (this is quite common).
I mostly drink [Jasmine Pearl](https://www.rishi-tea.com/product/jasmine-pearl-green-tea/lo...) or [Matcha Gyokuro](https://www.rishi-tea.com/product/matcha-gyokuro-japanese-gr...). If I want a no-caff drink instead, something based on [Rooibos](https://www.rishi-tea.com/product/ginger-lime-rooibos-organi...) or [Turmeric](https://www.rishi-tea.com/product/turmeric-ginger-organic-ca...).
If you like darker teas, their black, oolong or pu'er teas may be your speed.
For Chinese teas easily found in the US, dragon well (longjing) and iron buddha (tie guan yin) are very drinkable green teas. Iron Buddha tends to taste a bit more metallic, leafy, and sweet, Dragon Well tends to have a warmer flavor with a tiny hint of savoriness. Both are much lighter in flavor than, say, Earl Grey, which makes them very drinkable even in large quantities, but if you're used to Earl Grey you might not be able to taste these teas. If you want a stronger, more earthy, less leafy flavor, you can find puerh fairly easily. There's a very large range of quality for puerh, so this can be a rabbit hole. As a general rule, you should only buy loose leaf for Chinese tea varieties. I've had dragon well in a bag/sachet before and it tastes like a poor facsimile.
I specifically didn't mention Jasmine because Jasmine tea is often a lower grade of quality in the US, which has the downside of tasting too leafy/bitter/heavy on tannin. If you find a higher quality loose leaf Jasmine, it's also a very drinkable tea that you might like.
In general, I personally prefer leaf-only-no-added-flavors teas, but everyone's tastes differ. What I recommend to everyone who asks is to try a lot of varieties from different countries (mainly China, Japan, India, and try white, green, red, and black varieties), try a few of the flowery/herbal/fruity blends, and settle on whatever you like.
The aroma of it is something completely different than cheaper green teas.
They use biodegradeable corn starch based tea bags.
I'm curious to try some others mentioned in the comments.