I like red raspberry leaf tea. I learned about it while expecting and still like it. It is mild, which I like sometimes.
I drink plantain tea for its health benefits. It is great to keep colds in check. It does taste better with a touch of wild mint leaves. ;) Plantain is a great herb.
I have recently been trying chaga tea too. It is pretty tasteless.
I prefer drinking teas for their benefit over just flavor. You can improve pretty much any tea with a hint of spearmint.
If you want great health benefits and a strong shot of (Christmas-y) spices, you should try making Yogi tea. It is great tasting and is good for colds, circulation & more! If it is too strong, water it down a little. I think this now qualifies as one of my favorites.
http://www.harisingh.com/YogiTeaByYogiBhajan.htm