I heartily second Warren's suggestion as to the Sistrum platforms/racks. I got amazing results with these in my system. By far the best isolation devices I've tried (and believe me I've tried a few).
Does highend heavy amps needs ampstands?
I know for sure that my CDP needs good support but how about big amps. My big Rowland 8 is now directly on the wood floor bween the speakers. How does floor vibration effect sound on amps? Any particular amp stand to recommend?