I have seen a good number of racks in my day :) There was a very good thread about this a long time ago, the name was something similar to "dampening or isolation" or "dampening vs. Isolation" and Redkiwi made MANY good pointers for building/buying a "nice rack flo".........ugh, uh never mind just plain "nice rack". If I could find it I would post a link but perhaps someone else can find it. Good luck
Tim
Tim