What is your budget? First, Invest in a decent pair of components (Alpine, Focal, Hertz et al) and a 4-Ch Sony or any other consumer grade name-brand amplifier, a small 8-12” subwoofer in a sealed box.
This should cost you around 30-35k in total and it is entirely reuseable in any car. Sound quality in-car entertainment goes from 01 to over 9000
I have a similar setup and i move it to any new car i buy and it has been almost 5 years they are best money i have ever spent on audio.