I'm currently working with a friend on a system for my S2000. We're shooting for completing the project this weekend, and I will have pics when I go home to finish up the interior swap/help with the system. The setup is going in along with a black interior (well, the black interior went about 90% in this weekend which wound up being dumb since we'll have to get behind the dash and carpet again to run some more wires ). The goal of the system is to provide high quality, clean sound. I'm not very concerned with having the louded system out there by any means and to me clean is preferable to decibal level. The system is being designed so that the sub and amps can be removed very quickly and easily so that I don't have to spend a lot of time on removing/reinstalling them when I go to autocrosses.

Here is the list:
Headunit: Alpine iDA X001 headunit with ipod adapter (had it for 10 months and don't like it but the ipod interface is simple so it stays for now... double din touchscreen in the future though)
Amps: Alpine PDX 1.600 (sub) and 2.150 (speakers)
Speakers: Polk Momo MMC6500 components in the doors, Polk Momo MMC650 coaxials mounted behind the seats
Subwoofer: one Rockford T110D4 stage 1 10" sub in the spare tire well with custom fiberglass enclosure.

I picked the PDX amps the instant I saw one because they're so damn sexy looking. They will be clearly visible in the trunk so I was really trying to find something that will fit my power needs and look exceptional. I had the 2.150 amp before we decided to go with the behind seat coax speakers so its not quite optimal, but it will work fine for me.