Need advice, sub/amp

I am replacing the factory system in my 2003 Ford Explorer. I am into sound quality, not being heard from three blocks away...and wanted some advice on what sub and amp to run in my system. I just switched out the head unit with a Pioneer DEH-7600MP, and have replaced the factory speakers in the doors with Infinity Kappa 5 X 7's, rated at 100W RMS (300 peak). Right now I am running them with the head unit powering them, but I want to get a 4 channel amp to power the Infinity's and then get a mono amp and a subwoofer.

I want tight accurate bass, but also want good performance when listening to R&B occassionally. I was thinking about a single 10" sub in a sealed enclosure. What do you guys recommend for the sub and the amp? I would say my budget is about 150 for the sub and about 400 or so for the amps if I can get anything decent for that. I could possibly move up if I had to and it was worth it.

I'm not too familiar with the best brands....I'm open to suggestions. Thanks!

Definatly stick with 1 10" sub and  get a SEALED box. Without a doubt, sealed boxes provide the most acurate bass response.

if your buget is in the 550 range..your gonna be good..

How about keeping your entire system infinity?

the infinity reference amps run on the $300 range, and an infinity kappa perfect 10" sub is about $120. throw in the sealed box and the 8gauge power wire( id reccomend 8 gauge for what im talking about)

your still well under 550.

Infinity Kappa Perfect 10.1d dual voice coil 10" subwoofer about 150.00

use the Infinity Reference 610A  mono amp it will give you about 600 rms at 2 ohm. 299.00

in s nice sealed enclosure. run this sub in parrallel to get 2 ohms adjust your gains right and this will sound great.

Infinity Reference 750A 111 X4 for 299

or the Infinity Reference 752A 142 X 2 for 150.00 and run this to your fronts and your rears with your deck. this amp is better for your budget but I would chill out some more for the 4 ch.

actually I have a couple of questions.....that woofer is only rated for about 350 RMS. Wouldn't the 610A  overpower it at 600 watts RMS? Also, my satellite kappas are rated at 100 RMS.

infinity has a new 6-channel amp available as well, if you're looking to go all infinity and/or want to save space.  The 2 sub channels would just get bridged to power a single sub.

Like yourself, I am more about overall sound quality and balance than just having boom that people can hear from miles away.  That 110 watts per speaker for the infinity 4-channel is an incredible amount of power.  In my opinion it's a lot more than you'll need.  I use a Rockford Fosgate P4004 amp to power my speakers (Infinity kappa 52.5i in the front and 62.5i in the rear).  I can tell you I am incredibly pleased with how good it sounds, and I have turned it up loud enough to the point where my ears start to hurt, and it's still distortion free.

Just something to think about....