Help needed to find good car sound system

I want to get a system that has some great bass for around $600 or so. I have been looking around but have not found much of anything so far. I already have a head unit and some aftermarket 6x9's and 6-1/2's so I really only need some subs and an amp. I also have one 12 that I got recently, it sounds good but I want something better for the car i am getting. Any suggestions will be greatly appreciated. Thanks.

what car will it be for?

what car will it be for?

It will be for a 2001 dodge intrepid.

an RE SX 15 and an eD nine.1 would work, should end up right around $600 total

Of course then you have shipping and the box, so it might go over a little. If that's a problem then you could step down to an SE

I would go ported with either, you'll have to custom design/build your own box though

IDMAX, jbl 600.1 or 1200.1 i think the 1200.1 will give this sub a little too much so if you go with that, be careful with the gains.....

or 2 oz audio ME's, and one of the above amps, the 1200.1 will probly work better

thanks for the help, and do yall know any good sites to check out?

RE
www.reaudio.com - buy factory direct

eD
www.edesignaudio.com - buy factory direct

ID
www.imagedynamicsusa.com - have www.sounddomain.com pricematch www.speedsound.com

JBL - not sure where you can buy for cheap

JBL - not sure where you can buy for cheap

http://www.cardomain.com/shoplist~b~JBL~t~Subwoofer+Mono+Amps