your first problem is looking at coaxial 6x9's. if you want detailed sound quality you should look for 6.5" components.
of that list, i would consider JL or Boston. I wouldn't install the other three.
i don't like Kappa speakers either. a lot of metal dome tweeters are "bright" but not all metal domes are. a "smooth" tweeter is one that has a low resonance. properly done, metal or silk can be smooth. IMO smooth metal dome tweeters are usually more expensive.