subs do not need to overwhelm the other speakers. you can setup a sub so you can barely hear it, or so that it is all that you hear...
those are some very nice speakers, though if you like softer highs, those tweeters are known to be horrible... most high end sound quality places will buy just the mid, and pair it with a better tweeter
i would recommend getting at least one 10" sub, a mono sub amp, and a amp for the main speakers--when setup correctly, the sub will allow the main speakers to play louder and cleaner.
overall, those speakers are extremly refined, so they will have very poor bass output(they are really designed to be used with a sub...).
there are literally millions of different options for stereo stuff. the best advice i can give is to go to a stereo shop(do not go to a large chain store like best buy-- they only want to sell you whatever they have in stock) with some of your favorite music, and try out a bunch of different speakers. a decent shop will be more than willing to work with you to find a speaker/setup that you like.
and just fyi: this site is mainly dedicated to car computers, so most of the time, audio systems are not the main priority for most of the installs. feel free to stick around though. otherwise, there is a sticky at the top of this forum with some of the car audio only forums.