Hands-down favorite, my 73.5 Porsche 911T - I miss it dearly.
Not far behind:
My '69 Mustang FB Gulfstream Aqua stick car, my red '67 El Camino, the family '73 Nova 350 hatchback I got from my grandparents.
I really liked my '89.5 Mustang LX 5.0 stick car, too; more than my existing '97 Mustang GT stick car, actually.
The Mopars I let go & would like to have back is another list...but ya can't keep 'em all...