So after never really touching a stereo system outside of getting a new H/U in my old Altima, I've begun to look into making the STi a bit more sophisticated.
A local guy sold me a JL Audio 10w3v3 sub and is making me a custom enclosure for it; this is costing me $275 total, which is a pretty good deal.
I have nothing else upgraded, so this will sit with the rest of my parts until I get everything purchased.
I don't need the top-of-the-line products, but if I'm going to spend money, I want to do so wisely.
Here's the system I've spec'd out for myself...
Headunit: Alpine INA-W900
Amplifier: Alpine PDX-5
Front Speakers: JL Audio C2-650 Components
Rear Speakers: JL Audio C2-525X Speakers
Subwoofer: JL Audio 10W3v3
Subwoofer Box: Custom sealed unit
Sound Deadening: All four doors and trunk