I don't much care for Stash's tea, either.
Adagio is my favorite, at the moment.
I have never purchased from Rishi, so I can't really give an opinion. However, from the reviews I have heard by other chatters, I think I may order from Rishi in the future.
On the other hand, I have ordered from The English Tea Store and In Pursuit of Tea and loved both company's products and teas. Also, I just recently started buying from Tazo with no complaints.
I hope that helps!