I'm still looking and agonizing over sub decisions. So many things out there..

I was thinking Fi SSD's, but I want other options as well.

Here's what I want:

Three 12", 4ohm DVC

Good mix of SQ and SPL, with a bit more SPL

$250 or less (preferably in the $200 range)

Sealed box @ about 1.25cu ft per sub (net displacement)

Someone suggested to me the new Hertz HX300's. Has anyone heard these? How do they sound, and how loud can they get?

SSD, personally I'd look at the Q for a sealed box

Mach5 IXL

SSA ICON

All would be fine. What do you mean by a good mix of SQ and SPL. SPL and a small sealed enclosure don't really go hand in hand.

SSD, personally I'd look at the Q for a sealed box

Mach5 IXL

SSA ICON

All would be fine. What do you mean by a good mix of SQ and SPL. SPL and a small sealed enclosure don't really go hand in hand.

I want good SQ, but at the same time, I want it to get decently loud.

with ample power, even in a small sealed enclosure, all of those will be pretty loud i'm sure. if you are planning on doing SPL comps i would say otherwise, but for a DD system thats sounds good on a variety of music and gets plenty loud you should be fine with any of those drivers in a sealed setup

Have you heard of Carpower Sonic-12?

I have not heard about this one, but it migh be worth check it out: Exile Audio XPE12D?

Meh........