I have tasted some Korean greens, I believe they were ordered from Shan Shui Teas ( http://www.shanshuiteas.com/, they aren't having any of '11 though). They all had something to do with Chinese flavour profile, while being somewhat similar to Japanese greens. Based on a single tasting I would consider Saejak and Joongjak to be quite "normal" green teas, somewhat like Sencha and Bancha, for example are normal. Ujeon/woojeon was something entirely else, similarly to Gyokuro. Not that it tasted to same, but it was somehow entirely different from those other categories. Better, finer but also entirely different.
Based on this, I would recommend getting a small batch of Ujeon as well, if you're ordering some Saejak.