CD Deck...Amything really with 4v or higher preouts. Lets say $200

Component Speakers - $200-600
Amp for Components $150-$300
Subwoofer- $150-$600
Amp for Subwoofer - $300-$600
Amp Install kit - $25-$99
RCA Cables $20-$80

Hmm...thats just about all i can think of what you'd need now.

If you'd like brands, i could list em all now.

I will tell you this, Good car audio will cost you. Unless it's a hobby, or you KNOW you want a system with optimal sound, it wont be cheap. I jumped right in about a year ago, and never looked back. Now that i did, i've spent in excess of $3500 ...Whew..that'd be a lot of booze, or a new used car. I dont know. Im happy though