Jumping in here... I'm new to the Chat and noticed this thread.
I love a really good golden Yunnan tea as well. The one I have used to measure all Yunnan Gold teas by has been the one from Tao of Tea called Emporers Gold from several years ago. I don't know where they got it but the owner shops for most if not all his teas from the source, hence they have really good teas most of the time.
http://www.taooftea.com/detail154-Emper ... _Gold.html
However this tea has varied over the years. I found it hard to find a year or two ago. Now they offer an organic version which I'm not sure is the same quality or source. But it might be worth a try for you. I notice they don't have bulk but they have tins of it still in stock.