[McCobra]

I would use a 2x6 or 3/4" plywood base and top it with either of the following products which are relatively sturdy, inexpensive and easy to replace.

I second the idea of -Tempered Hardboard
or
A Melamine topped Hardboard or Particle Board-Melamine is a resin impregnated paper bonded to the substrate that is pretty tough. (Same material that you often see on the shelves of new cabinetry)
Pretty sure the Home Centers carry this
Good Luck