First off, what is your definition of "show quality"? A finish that will rival those of a Riddler Award winner, or a finish that will stand out at some local get together??? World of difference in the two!

I usually use PPG, the Cutlass will be House of Kolor, used to use Sikkens.... They're all good, but if you want a show quality finish on a car the prep work and panel fit is far more critical then what brand of paint to use. A lot of it is just preference, anyway.

There is no "magic bullet" paint that is guaranteed to turn any car into a show car, but quality body work, using the right materials in the substrate, proper application of the paint and clear coat, and the correct sandpaper, compounds, and pads along with their correct application can make most any paint "show quality".