I'm happy to say I made my first purchase from o-cha! It was on the pricey side but I figure it'll be well worth it. Since I am, however, stuck with Teavana's sencha for now. Bleh.
I know I can't post links yet so I'll just name what I bought, based on recommendations and reviews:
Kagoshima Sencha Yutaka Midori
Chiran Sencha "Supreme"
Shizuoka Green Tea Daily Sencha (for a cheaper, everyday sencha)
and the Tokoname Teapot #KI703.
I want to try gyokuro but it was all very pricey. Maybe when more funds come in and I've honed my brewing skills.