you can get a JBL 1200.1 mono block amp (the same one i just purchased) from woofersetc.com for 300 bucks plus shipping, you should also be able to pick up a L7 solobaric sub from Kicker off of there or ebay really cheaply, but dont forget to keep in mind you are probably gonna need wiring, cap, new battery, or upgraded alternator. and all the fiber glass, MDF, etc. that your gonna need when YOU install it yourself with a guy that you have help you. my next door neighbor is helping me with my install this weekend, dont waste your time with places like Car Toys.
<img src='http://img268.echo.cx/img268/1430/zkwsig23iq.jpg' border='0' alt='user posted image' />
1996 328is Black
Suspension: MB Motoring 18x8, Kuhmo Supra 225/35/18ZR
Audio:Eclipse CD3414 HU
Lighting: ZKW W/ DDE PLUS