Well, after more than 4yrs on this board without posting any pics of my system, I thought I should share.
Pioneer Premier 740MP head unit and a Clarion Sirius tuner. The on/off switch is to manually raise/lower the antenna, as the Pioneer HU wants it up whenever it's on (regardless of source).

Here's where I mounted the Sirius antenna. Works great and is very discreet.

Here's a pic of the 4ch Lanzar Rack amp that powers my system. It was $79 and puts around 80w to the components and 250w to the sub. I've got a 2ch Lanzar Rack amp in the closet that will eventually take over sub duty, and I'll use the 4ch to bi-amp the components.

Here is my Lambda Acoustics PB-12LE in its custom sealed enclosure (about 2ft^3). Although it's hard to tell in the pic, it takes up very little trunk space. It's shaped like a triangle and is about 4" deep on top and 10" deep on bottom. I've still got to put a grill on it for protection.

Finally, here is a pic of my Vifa Neo's flushed into the door. I went through something like 4 tweets in that spot before finding some that sound perfect there. Behind the grill are some 7" Vifa PL's and some Soundstream Exact passive crossovers.

Overall, it's not a very flashy system. It's performance is great, though. I'd estimate that I've got around $600 in this system.