Here is a ranking done by a program on the Discovery Channel. It seems like a very arbitrary list to me. It is hard to understand what they are basing everything on. But it was a interesting show regardless. I liked the part in the show where the guy says, the Skyline is like a Japanese salary man. Plain on the outside, but it really is a wolf in sheep's clothing.
Lamborghini Countach (5000QV)
Year: 1984Power: 455 HP
Engine: 5,167 ccm, V 12 mid-engine
Weight: 1,494 kg
Top speed: 306 km/h
Rank: 10th
Nissan Skyline
Year: 1968 onwardsPower: 400 HP
Engine: 4,500 ccm, V8, Biturbo
Weight: 1,400-1,800 kg
Top speed: 260+ km/h
Rank: 9th
Corvette Sting Ray
Year: 1967Power: 300-435 HP
Engine: 6,490–6,999 ccm, V8
Weight: 1300-1371 kg
Top speed: 240 km/h
Rank: 8th
Aston Martin DB5
Year: 1963Power: 285.9 HP
Engine: 3,996 ccm, V12
Weight: 1465 kg
Top speed: 229 km/h
Rank: 7th
Mercedes Gullwing SL
Year: 1954Power: 215 HP
Engine: 2,996 ccm, 6 cylinder
Weight: 1295 kg
Top speed: 235 - 260 km/h
Rank: 6th
Ferrari Enzo
Year: 2002Power: 660 HP
Engine: 5,998 ccm, V12
Weight: 1,365 kg
Top speed: 360 km/h
Rank: 5th
Jaguar E-Type
Year: 1961Power: 320 HP
Engine: 3,781 ccm, 6 cylinder
Weight: 980 kg
Top speed: 270+ km/h
Rank: 4th
MacLaren F 1
Year: 1994Power: 627 HP
Engine: 6,064 ccm, V12
Weight: 1,140 kg
Top speed: 368 km/h
Rank: 3rd
Mazda Miata
Year: 1989Power: 116 HP
Engine: 1,597 ccm, 4 cylinder
Weight: 955 kg
Top speed: 220 km/h
Rank: 2nd
Porsche 911
Year: 1964Power: 130 HP
Engine: 1,991 ccm, 6 cylinder boxer
Weight: 1,080 kg
Top speed: 210 km/h
Rank: 1st
http://www.discoverychannel.com.au/greatest_ever/sports_car/index.shtml