I am having a custom pair of speaker stands built for me, but I have a question about the top plate. First, here are the general specs(per stand): 10" W x 12" D Granite Base (4) 20" H x 2" Diam. Stainless Steel Pipes 7" W x 9" D Top Plate What should I use as the top plate? I considered Corian, but was advised against it because nothing sticks to it. The Paradigm Studio 40s need to be fastened to the top plate in some manner w/o marring the speaker. Should I go with MDF? Stainless Steel? Regular Steel? And What about under the granite? Superspikes, Spikes w/ vibrapods, or feet of some sort? Thanks in advance for any advice one might have.