Gold is supposedly the best filling material, assuming it is high purity and not mixed with toxic metals. Gold is very expensive though. I have porcelain inlays or onlays for my large cavities, and composites for the smaller ones. Composites are not recommended for large fillings, especially on the biting surfaces of molars. How much more will gold inlays or onlays cost compared to porcelain?

There is one other issue. Having gold and mercury fillings in your mouth might cause a galvanic reaction, and a greater rate of mercury leaving the the amalgams. Asthetically, I think porcelain looks much more natural than gold, but gold might last longer. I say go for porcelain.

Do you feel ill now? How old are you? Some would say if you don't feel ill and the amalgams are in good shape, then leave them alone. Others would say gets them out ASAP. How old are the amalgams? If they are quite old, it would be a good idea to have them replaced before they start leaking.