The three that had the biggest impact for me are as follows:
1) YSL pour Homme (vintage) which was the first fragrance I ever took notice of when I was a kid. It took me over 30 years later to buy a vintage bottle, but I still have fond memories of that first experience.
2) Giorgio for Men (vintage) which I have worn consistently for 25 years and probably love it more now than when I first started.
3)Original Polo (vintage) which was the first fragrance I wore with any regularity while in high school.
Honorable mention to Cool Water (vintage) which I probably could have swapped for Polo as it was a similar experience.