Spikes or Feet

I'm setting up my system in my new house and need to decide weather I want to use spikes or flat feet on the bottom of my equipment rack. The rack will hold the amp, preamp, CD, tuner and cassette deck. Pretty heavy stuff. The TT will go on it's own shelf. The floor will be wood (actually laminate wood), but not worried about damaging finish since the spikes do have protective feet.
Which do you think would sound best and provide the best isolation?
Thanks