do some research and go to a shop and get some estimates. ive seen quite a difference in the quality of sound depending on the installation more than the equipment. same equipment running on no name amps but tuned and installed by someone with skill sounded amazing versus top name amps, equalizers with improper guages and maxed gains etc just installed together sounded like crap. Look for shops where the installers are MECP certified off the rip. that car audio training takes years and the level of quality is much higher in the stuff ive seen. i ive in the the land of car audio, the difference is going to come down to the installation and adjustments of everything you buy. Alpine as a brand seems to fit what youre looking for, fosgate is higher quality stuff too. PRV, Orion( higher level stuff), DS18 is all stuff ive heard and seen quality from. Sundown audio subs are awesome. if you dont mind taking the thing inside and out of the car and letting sit in the backseat, consider a chuchero system. its compact, cost less overall, and if installed right can sound amazing, theyre removable too from the car.