Don't forget, if your using artwork on the surface, and t-molding on the edges, you can use particle board. Or, if you want to get a little more expensive, they make Baltic Birch plywood in a lot of thicknesses.
Both have the added benefit of not being as heavy as the MDF.
My most recent project was 5/8" particle board + Formica Laminate and it was perfect for 11/16" chrome t-molding.