someone's is going to chime in and say you should have gotten the h/k 17.
Hahaha, then you are going to get those who think that setup sucks also.
Audio design is a very emotional and personal choice. So, one thing I did when I had a Prius, yes I had one of those and we called it a scooter. LOL. I changed out-the-door speakers and added an amp with the stock radio head. It was a self-contained powered amp with a built-in crossover. It worked very well.
With this car, I used a generic Dynamat off Amazon (Kilmat) and lined everything - doors, trunk, headliner, anywhere I could find bare metal I turned my car into a sound studio. It made my system so clear and clean, I could not believe it. It also reduced road noise and frankly, I think would still perform well if your windows were down. Good luck!