Probably near the top of the list would be my '66 Buick Wildcat coupe, red, black vinyl top with white bucket seat interior and factory wire wheel covers. Gorgeous looking and great highway cruiser. Traded for a '61 Catalina bubbletop, which I also miss.
There are others but the one I miss the most was a '59 Pontiac Star Chief Vista purchased in 1980 for $1,100. No rust, 21,000 original miles. Sold in 1988 with 43,000 miles for $3,500.