While RF makes some good products, the direction that company seems to be heading now is "More watts for less price by sacrificing sound quality". I would never buy a RF product.
Alpine makes good HU's (Head units/reciever/CD player/whatever), and from what I hear, their Type R's are good speakers. Their amps are good, but overpriced.
Eclipse makes HU's that a comparable or better than Alpine's. Their subs are good, and their amps are good.
Phoenix Gold makes damn good amps at a damn good price. Dollar for dollar, they can't be beat. Their speakers are also top notch.
Adire Audio makes some sexy speakers. I wouldn't hesitate to run their speakers in my car, or home.
Infinity, the quality you expect from their home euipt. you can expect from their car equipt too.
Polk, their car audio isn't as good as Infinity.
Visit some of these car audio specific forums, and look around and ask question.
http://www.the12volt.com/installbay/
http://www.elitecaraudio.com/
http://www.soundillusions.net/
http://www.soundbuggy.com/forum/index.php
Paul