ICE Thinking about a "proper" install?

2. Speakers

Unless you're going for a cinema sound 5.1 install, then you only need speakers in the front. Having them in the back drags the "soundstage" to the rear of the car. When you go to see a band, you don't face away from them do you? Fit the biggest speakers you can (5.25" minimum) as they will be the source for midbass upwards. A system lacking in midbass is not good. Match the RMS power of the speaker to the RMS power of your amplifier.

6x9s on the parcel are fine for those after cheap easy bass and a bit of volume, but they don't really belong in a "proper" install. You'll get all the bass you need from the subwoofer.

Again, try and get a listen to some in a shop and scour the net for reviews.