[Grovlet]

Nothing wrong with Pioneer - but I feel like a few others are a little more sound/value focused:

I prefer Inifinity Reference Series for lower cost speakers:
Infinity Reference Series
I'm not sold on that sub - I would also opt for a little more power handling - I've heard Dayton Audio is a good sound/value:
Dayton Audio 10" Dual 4 Ohm Voice Coil (Wire in Parallel for maximum power)

For Amps - I've tried a number of different Mid Range Audio Brands, and plan to replace my amps this spring - my research has found the HiFonics to be a good value these days:
4 Channel - Zeus Series
Sub Amp - Brutus Series

And don't forget about RCAs & Power Wire & Distribution/Fuse Blocks: I've used KnuKonceptz in a few different applications :
Karma Series RCA
Power Wire

You can also check - OnlineCarStereo.com for other options

But yeah with loud cars you need loud tunes