Custom Olds 442's.  I haven't decided if I am going to pursue this casting, as it has become incredibly expensive, but if opportunity knocks at feasible times, I will acquire additional examples.  The yellow Spectraflame car recently fell under this category.  I learned not too long ago that the reason the Olds 442 was produced for only a short period of time was that it was too costly to prepare the raw castings for nickel plating, due to excessive flash.  It's a shame, because this casting is one of the best ever.