Top 3 in no particular order...
1957 T-Bird, D code, Inca Gold or Starmist Blue. Just because it's always been my favorite car.
1966 Pontiac LeMans, 326 4 barrel, preferably with black vinyl roof. Dad had one back in the day.
1979 Formula Firebird. 403 Olds. T-tops and snowflake wheels a must. Had one in high school and college.
I'm always casually looking. If a nice example of any of the above came up I'd seriously consider a purchase.
Also, wouldn't mind a Model A or a 1968-70 Corvette convertible some day.