Never mix tea and coffee.... coffee is still healthy you know. It is loaded with anti-oxidants, the only harmful bit is that the acidity is hard on your stomach and the caffiene can cause a physical addiction. If you want something uber healthy try Yerba-Mate. You can even brew it with a drip maker. It tastes kind of halfway between green tea and chewing tobacco. It has 0 caffiene but has natural stimulants.
I have a press for tea and a press for coffee. I drink both throughout the day to get variety... and because my stomach is really sensitive so I can really only drink one cup of coffee at a time without feeling sick.
If you want a coffee style drink made from tea, try Matcha. It's a high grade japanese tea that is ground to powder and then you dissolve it in water. Make a latte out of it by adding frothy milk and some sweatner.
