you are already at a good start. www.sonicelectronix.com has the best deal on car audio in the U.S. you can get 2 12"s, 4 ohms, 400RMS for about $65 each. preferably kenwwood. you can get a box for 2 12"s for $50. preferably sealed. you can get a 1400watt sony amp for $160. this gives you 220RMS x 2 @ 4 ohms. thats good stuff to start with. and finally, you need the wiring kit, thats like $20 from Wal-Mart. includes power wire with fuse, ground wire, and remote wire. the remote wire hooks up from the amp to the cd player. the total price for that is $360. if you want more power you can get a bigger amp, but make sure the RMS doesnt exceed the RMS for each sub. and you might want to get some 6x9's for the rear. hope this helps!