At the moment. I have in a 1990 Potiac 6000 four door:
Pioneer Premier DEH-P660 HU
Infinity Reference 4x6 component plate speakers up front with
BassBlockers@300Hz
Infinity Reference 3-way 6x9's mounted to rear deck
I can barely believe how much better this set-up sounds over the
factory setup lol

Anyways, I am soon planning on purchasing two 10" Infinity Reference
DVC subs and feeding each 250w RMS, probably from a Rockford amp
unless I am convinced that another would serve me better. I have about
$600-$700 to spend.
Where I'm stuck is whether to put them in a pre-fab sealed box or a
pre-fab ported enclosure. I know nothing of enclosure sizes and tuning
them. Like most peeps, I'm going for sound quality, tight, fast, but
still loud bangin bass as I listen to techno/trance/house music at
high volume.

Which box would you recommend? Crutchfield.com says ported for louder
bass, and a sealed box for high power applications. They didn't
specify how much power is "high power". I'm new to this all. If you
have any real good car audio links applying to this stuff then that
would be great too. And, where I can get a guide to installing the
amp, as far as wiring what to what etc. I've installed everything
myself so far as I am an electrician by trade and would like to
install the amp/subs myself to =)