Bought my FR-S on October 5th of 2012. Haven't done a whole lot to it yet since I'm still trying to recoup from the down payment + first two monthly payments.
I'll break it down in two parts, what has been done and what's going to be done.
Already done:
Pioneer SPH-DA100 head unit paired up with my Galaxy S3 running AOKP 4.2.1
2 12" Alpine SWS-12D4's
Kenwood KAC-9105D amp @ 1 ohm
Generic "ground shaker" enclosure from Sonic Electronix
35% tint all around
Perrin plate relocation
Whole car has been fatmatted
Invidia N1 exhaust
Will be done:
Rocket Bunny body kit (don't care, I absolutely love it)
Toss up between just going with a drop in air filter replacement or a full kit
2 x 12" JL Audio 12W3v3-4's
Rest of the speakers (still undecided there too)
Vortech supercharger (no, I don't want to go turbo, sorry!)
Misc upgrades TBD
Current state of my FR-S:
http://imgur.com/a/eVuEM