Assam, Russian caravan, Darjeeling (of course) for black teas... I admit to liking fruit and spice teas a lot, especially black currant and orange spice. Jasmine tea is nice when you don't want anything too dark or bitter.

Teabags make an acceptable cup of tea but you absolutely have to put the bag in the cup first, then pour the boiling water over it. Otherwise it won't steep well.