Audiobahn is one brand I wouldn't mind taking a look at. I don't know where they're carried in my area though. JL Audio is another good one, especially for subs. They carry good value ones to very nice high level ones, but you do have to pay for them. Their website is very informative and they carry both components and coaxial speakers. I haven't heard of Focal, but I guess I'll check them out. To show how crazy I am, I'm already doing research on how the soundsystem in my next car will be when I get it a year or two from now!

Be sure to check out some of the custom installs that companies do. They may give you some ideas on how to mount speakers. I've seen one somewhere in the JL Audio page that had the tweeters of a component set in the shape B&W teeters do, sort of like a horn. This was fastened to the dash. If it's placed right I could see it being possible to have this without damaging the car. I'll try to find it later.