Nakamichi is a great company. Love their HU's, love mine. Never had their speakers, but I would imagine they are great for everything save maybe rap.
Infinty speakers are great. Reference and Kappa series to be used as presribed by PMB.
Kicker makes better subs and amps. Their comps are good for rap and rock though.
Sony speakers suck. Period.
Polk Audio is comparable to infinity. Not as bright, some like that, others don't. Depends on your ear.
Which reminds me, go check out those listed above(minus sony), and make a decision based on what your ears tell you, not us. It's good to round it down to a few via the internet, but ultimately, everyone hears things differently.