In this order:
1 - C6
2 - C7
3 - C4
4 - C1 (toward the end of that gen with 4 headlights, I don't care much for the first ones)
5 - C2
6 - C3
7 - C5
The fifth gens look out of proportion to me. They have the big fat ass of the C6 that I like, but the front end is too close to the C4.