Yoon -
Nice post. I used to overlook the Rheinhessen as well until a few years ago while working in Norway a fellow American Sommelier and Riesling fanatic turned me onto some amazing wines from the region. Weingut Battenfeld-Spanier, Weingut Kühling-Gillot and Gunderloch to name a few. The first 2 being Biodynamic and I think the Gunderloch practices organic methods as well. It truly is an interesting and dynamic region. The people are really nice too. I look forward to my next visit.
Have fun.