For finding the best speakers, you usually have to rely on recommendations from other people - unless you can afford to buy and swap out a bunch of drivers/enclosures until you find the "right" ones. RonRizz and the other audio gurus should be able to point you in the right direction.
For speaker wiring, there is no need for high-dollar "boutique" wire. A good-quality, multi-strand wire works great for car audio and all but the most demanding home systems. You can find charts that tell what size wire to use for a certain power level. From an electrical standpoint, the bigger the wire (the less resistance) the better but you run into problems routing the wire if you go too big.
You're never going to get true high-fidelity in a car so get whatever sounds good to your ears.
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