I would get a bunch of samples from different places.
sticking with some samples from adagio may be a good idea, but it could also give a bad representation since higher quality can be found from a more specialized vendor.
Yunnansourcing, jingteashop, teaspring, norbu, o-cha, yuuki-cha, fivestartea, chawangteashop, essence of tea, tea urchin, houde, dens, ippodo etc
We also have members on teachat who are vendors...Origintea, white2tea, Hakoniwado, Mandarins tea room
Before you buy tons of tea to try I would make sure you have a decent setup.
Good water, good kettle that doesn't ruin the water, proper brewing vessel and cup.
For a nice nighttime tea...http://jingteashop.com/pd-jing-tea-shop ... a-ysbc.cfm