I usually top my Fiat and my girllfriend's Polo 1.0. 150kph is enough fot both.
The only two cars that I found amusing to top were the 2.5 Boxster and the '88 BMW 735. That's is going a bit fast! The BMW had far more grunt at high speed than the Boxster of course, only giving up close to 240kph. Porsche's needle stood quiet soon after 220.