Go Boston Acoustics. I have the cx 7's in the front, and a pair of the cx 6's on the rear deck. I also have Infinity Reference 12 subs. I have two in a bandpass box, and they rock, but my roommate has one in a sealed box, and it still rocks pretty hard. My roommate has a Civic, and he has one amp powering his whole system and it is sweet. He uses a Sony XM754 (75x4 at 2 ohms), and he has the front right speakers on one channel, the front left speakers on the other channel, and the sub on the 3rd and 4th channel bridged. It is a great sounding system for not too much money. He also has the Sony in dash MP3 deck which is really sweet.
Here is a link to my car (I had this link in the cosmetics section by accident):
http://www.geocities.com/sonyisdope/sonyisdope.html
I will try to get pics of my roommates car up too.