Best material for an isolation platform?


I have an extra set of IsoAcoustics Gaia 2 isolation feet sitting around...I'm going build a platform for my integrated amp or transport. I have an oak shelf that would fit well 18x20x1.75. I could just as easily use MDF. Does the oak have any sonic drawbacks?
 Any thoughts?
larseand
I would personally take oak, rock maple or black walnut any day over MDF. More esthetic and those natural woods do not present a problem acoustically.  
I've been using butcher block acoustics for sometime. They look nice, are well constructed, and do not cost both an arm and a leg.
Most of my equipment (not speakers) sit on Corian bases. Although I have had decent results with bamboo, I prefer Corian to any wood in my system.  
I found oak to be not great under my turntable. Maple is better. I also found granite to be poor. 
Baltic Birch plywood (13-layer 3/4"), mated with a slab of slate, a layer of ASC Wall Damp in between them.