First you need to fix up your power source by adding Capasitor banks to ensure stable power supply without killing your car's battery.
For head unit, from experience Pioneer with special sub-woofer output is great.
For power amp, it depends on the type of music you are listening to i.e sound quality or Just loud and bassy. If you can't decide, try Rockford fosgate for your sub and Dyne Audio for the component system with the same brand.
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