I've been an Eclipse fan for years... They have a real clean sound.
They get abused as they are in custom kick panels and get hit with dirty wet shoes/boots all the time. As a result, I have one mid-bass that will bottom out, but only at high volume, on certain songs. It's the first time I ever had a problem with an eclipse product, and I can't say it their fault. I love the kick panel location of the speakers. Mine are Q-forms by Q-logic. They give you a near equal distance between left and right. Makes for beautiful stereo imaging in symphony music, or stuff like Pink Floyd.
I have had good results out of Infinity as well.
Looking to upgrade my system come spring. I'll be checking into JL Audio. I have their Stealthbox sub, and absolutely love it.
Fits in the center console, and thumps hard. It's a sealed box, and the bass is very tight and not mushy like most ported boxes. Being a sealed box, it needs a little more amp than I have on it, but it hits very good now. Impressive for a single 10" sub.
I've read some good things about Focal, but they are high dollar. I'll be going to a stereo shop to hear some systems when the time comes. I've never used any sound deadener, and I keep reading that it can have a dramatic effect on the sound quality.
Keep us posted. We may learn something from your experience.