I love a nice clean sleeper, so it's gotta be GO for me!
My VN V6 is a rocket compared to what I could drive and insure at 18 in the UK! Try doing 0-100 in 14 or 15 seconds (in a 1.3 litre), then get into a V6 commodore and see what you think!! It was only when I hit 25 I could afford to insure a 1.8 litre Golf GTI in the UK, so I reckon you guys and girls are really lucky to be able to drive commodores and similar cars at 17 or 18!