This is the direction I would go in... Aspects of the materials are taken from measured data but I only used the texture maps provided with the software to keep things basic. I would recommend that for a good effect, with any models (other than flat planes) you should always custom make the texture maps for the model.
I think that is the way to achieve the highest level of realism.
Basically the way I came up with this material is by using a mixture of 80% rougher material metalic material and 20% glossy force fresnel material, This is because when the on a microscopic level materials like this have a mixture of a glossy and diffuse surface even though the ior and 90 degree and 0 degree colours may be the constant...
Let me know if you would like me to upload the material... Btw the ones on the outer left are diffuse matte versions of the material that have had different treatment