How much hp is enough for street?

This question is debatable but I think there is a point you reach where any more performance of the car becomes pointless. With speed limits at 75 and most people driving no more than 80-85 on the highway, what would be the max needed for a fun car that works well in both city and highway envrionments?

Assuming same gearing of the cars, would a 150hp car with good low-end torque be better than a 200hp high revving engine with no very little torque?

My thoughts are that a well designed car near 180-200 hp is all you would need. My DD is a 200hp car that has very little torque but has a high revving (8300 redline ) engine that works great in all places and probably has more power than it needs.

This is just a consideration as more and more cars are becoming low hp, smaller, and more efficient.