Gyokuro, Dragonwell, Assam, Darjeeling, Matcha, Silver Needle, Sencha. Roughly in that order, though it's tough to compare green vs white vs black. On rare occasions I'll have jasmine in a white or green tea.
If we're talking brands, my favorite is Teavana, mostly because it's convenient (location at nearby mall) but it's also pretty good loose tea, though I'm sure there are tea shops with better teas.