Hmmm, for a Gojyo tea I would go for something like a Russian Caravan (http://en.wikipedia.org/wiki/Russian_Caravan) blend -- strong, dark and more than a little smoky -- blended with rosebuds for a bit of sweetness at the core. (RED roses for EXTRA ANGST, of course!)

Hakkai I'd think would be a very fine green tea, with no fragrancing or added spices/florals to distract from the subtle astringent purity of it all...maybe Gyokoru (http://en.wikipedia.org/wiki/Gyokuro) or other high-grade sencha.

Goku, given all the centuries in cold storage, could maybe be a very well-aged Pu-erh (http://en.wikipedia.org/wiki/Pu-erh_tea)?

Mmmmm, tea.