I added a Keel and Chris Harban plinth and Radikal motor to my Cirkus bearing table. Previous to this new Karousel, the consensus on the Linn forums were that the Radikal made the most difference followed by the Keel. Since I added all three simultaneously I can't confirm this myself. However, my table plays extremely well on a variety of components that I have tried it on. Very Quiet too!! Linn upgrades are not cheep, but they do produce some very sweet music. I don't know how the Harban plinth compares to a Green St. Audio, but I do know keeping resonances controlled is paramount. The Tangerine Stiletto Plinth is another CNC plinth/top plate which you may want to consider. Just make sure that the table is set up correctly by someone with a good track record. Mine was assembled in my home by a real pro. I ended up moving a short distance 2 yrs. later and it still runs great. I am thrilled with my upgrades.
Best of luck, and stay home and healthy.
Bruce
Best of luck, and stay home and healthy.
Bruce