There isn't really a "best speaker" for out cars. If you want a "best speaker", then you are looking at something like Focal Utopia Be, or Alpine F#1 speakers, which are about $6,000 - $7,000 a pair. Go to a few stereo shops (ones that know what they are doing, not best buy CC, no offence to anyone who works/d at one but we fix their screw-up all the time) and listen to speakers they have and let your ears tell you what's best. Everyone likes different sounds, and every speaker manufacture speakers have a distinct sound, which is why there are so many successful speaker companies out there. If they all sounded the same, we wouldn't need so many brands. I have MB Quarts in my doors, and they were almost a direct replacement since German speaker, German car. The only modification I made which is removing 2 small centering tabs from the factory speaker mount. The key is going to be the installation. Do your homework and find out who is reputable in your area for having QUALITY installations. not the flashy ones, the ones that you can't see, and sound great.