I drink my tea plain. I hate additives of any kind and am very picky when it comes to sweet teas.
The blends I tend to drink are Earl Grey and English Breakfast and I like them pretty strong. I used to drink Green Tea a lot, and even turned my mom onto it, but I don't like it anymore. For the bitter cold days, I drink Irish Breakfast. It's the strongest I have and wakes me up.
I love green teas too, sencha (the japanese one with toasted puffed rice), blossoming teas, jasmine tea... apricot or berry green teas.
I drink them plain without sugar, having some right now!
When I do drink black tea which isn't very often I'll add sugar to it, no milk. Sometimes fresh mint springs go into the tea so it's a moroccan extra sweet black tea. Good when eating cheese and bread or heavy breakfast.
I have a giant drawer at my desk dedicated to tea. I always bring at least one tea back when I go on vacation.
My favorites right now are
Mariage Frères -- Marco Polo and Sakura
Fortnum & Mason's -- cranberry tea, strawberry tea, and black currant infusion
Republic of Tea -- Acerola Cherry Green Tea
A vanilla fruit tea that I bought in bulk at a market somewhere in Switzerland
A caramel black tea from a local tea house
I probably have about 20 varieties in my drawer, I like to mix it up and have different ones all the time.