Welcome to the forums Whirly!
Personally, I feel that you have too much money invested in the headunit and amps. But of course, feel free to use what you like! It's just my humble opinion that your biggest time/money/attention should be spent on overcoming the car environment. In order to do that, you need to be prepared with good speaker locations and install, and/or alot of digital processing. (Analog works too, but it's quite expensive to get all the flexibility and power of a digital processor in an analog device).
To that end, I would highly consider a Behringer dcx2496 converted to 12v use. It's simply the most affordable, and somehow also the most powerful processor that's reasonably available. It should form the heart of your system.
As for speakers, take a look through the review forum and the general forum and see if anything strikes you. Choosing speakers is a very personal decision. Some people simply don't want the most objectively accurate speaker for the money, but the one that fits their taste in music.
And speaking of the sub, for a sq oriented system that's probably the least important driver. There's a whole host of affordable, well built 12" drivers in the market today. I would investigate the Peerless XXLS drivers, as well as the TC2+ subs as being the best bargains out there.
Personally, I feel that you have too much money invested in the headunit and amps. But of course, feel free to use what you like! It's just my humble opinion that your biggest time/money/attention should be spent on overcoming the car environment. In order to do that, you need to be prepared with good speaker locations and install, and/or alot of digital processing. (Analog works too, but it's quite expensive to get all the flexibility and power of a digital processor in an analog device).
To that end, I would highly consider a Behringer dcx2496 converted to 12v use. It's simply the most affordable, and somehow also the most powerful processor that's reasonably available. It should form the heart of your system.
As for speakers, take a look through the review forum and the general forum and see if anything strikes you. Choosing speakers is a very personal decision. Some people simply don't want the most objectively accurate speaker for the money, but the one that fits their taste in music.
And speaking of the sub, for a sq oriented system that's probably the least important driver. There's a whole host of affordable, well built 12" drivers in the market today. I would investigate the Peerless XXLS drivers, as well as the TC2+ subs as being the best bargains out there.