If you're interested in a tea with comparable caffeine to coffee, might I suggest yerba mate? Has the same health benefits as green tea, and the same or more caffeine as coffee. The flavor takes getting used to though.
As far as standard teas go, green white and black have much less caffeine than coffee; so you'd have to be drinking insane quantities to have equivalent caffeine intake.
Yerba mate. Don't think I've ever had it. I will definitely check it out. Thanks for the tip! Seems more sensible than drinking eight gillion cups of green or black a day. --)