As well as looks, what's behind the speakers is key
I think that a good pair of 6X9" quality speakers, such as the Infinities mentioned above could give a very satisfactory sound, if you have matching quality electronics to drive them.
But: I am not alone in firmly believing that the enclosure that contains those speakers is just as important as the speakers themselves, if not more so.
They must be mounted on a rigid, non-resonant surface, and the volume of air enclosed behind the baffle board must be of a critical size and made of equally rigid material.
To ensure that the enclosures are properly designed and built, I would suggest you consult a high-end car audio shop, and either follow their instructions, or have them build it for you.
You won't be unhappy. It has been proven over and over again that a speaker is only good as its enclosure allows it to be.
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“Courage is being scared to death, but saddling up anyway.” ...John Wayne...........................
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