Unfortunately I am smitten with the cars of modern day so my list will probably offend some. As I have very little clue what differs from on car to another under the hood here is my list based on what I like (predominantly based on how they look)
1) Lambourghini (any love them all) 2) Audi R8 3) Nissan GTR 4) Audi A5 5) Nissan 350z
1 - 1938 Jaguar SS 100 Fixedhead coupe : only one car ever made for the 1938 London Motor Show, and the war killed the production. The car is currently for sale in the Netherlands for 5 Million British Pounds. It is fair to say that it will remain a dream to me... 2 - Any 1935 to 1939 Bentley, preferably convertible or coupe, but a coachbuilt saloon would look good on me too... 3 - A 1930s Squire, such a beautiful automobile, and quite rare too.