I'd go with the Cyclone GT, for sure, and I even had the same spring failure documented above. Technologically advanced, light, elegant, beautiful.
I managed to bend a new tab on my spring to make it functional enough and eventually found in my toolbox the remains of another lower-end GT derailleur from Suntour that I bought for parts. Sure enough, it fit and worked great. As I recall, I bought it for a few dollars at a shop in Nob Hill in ABQ that moved or closed not long after!