You're probably not going to like my solution.
I have a Pioneer head unit that I put in the car right after I got it a year and a half ago. I put Pioneer speakers all around this summer and was not real happy.
So... I put a Pioneer amp in several weeks ago. The only way I could be happier is if I had a subwoofer installed, but what I have now does have enough bass to let me wait for warmer weather to install the sub.
Here's the equipment list:
Pioneer AVIC-Z150BH
Audiovox Sirius/XM receiver
Pioneer GM-D8604 amplifier
Pioneer TS-A6975R speakers
Pioneer TS-A1685R speakers
Kicker 11DS35 speaker
That's not an all inclusive list. I also had to buy the adapters for the steering wheel controls, the serial bus, the iPod and the Android plus some other odds and ends installation goodies. All told, I have about $1,500 invested in sound equipment for my car. Other than the sub, I'm about done.
I didn't do this to enter SQ contests. I spend a lot of time in my car, and I like my music.