+1 for the McLaren F1.

Surely you can add the WRX on the grounds of bringing affordable performance to the consumer.

There's a lot of cars that are icons but not many were actually great cars. I'd put the Mustang in that boat (Pun intended).

Worth a mention
Lamborghini Countach. Who didn't have a poster of this as a kid.
For Ford there is the GT40 and the AC Cobra
Aston DB9
Lancia Stratos
911. Love it or hate it. It's still around and bloody quick in the right hands.
300SL. Who needs a reason.
etc...

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MY00 WRX. 89 Prelude. 99 CRV