Holy sh.it, I'm outgunned here, but just updated it a few weeks ago so here goes:
Pioneer head unit from 1998
2 hitachi marine 6x9's that looked like crap and sounded worse
Sony 52x4 XPLOD head unit w/ aux input
2 infiniti Reference 6x9s
XM satellite radio, mounted on dash (here's a pic of where the XM is mounted...)
It sounds pretty decent considering the garbage it had before... The 6x9's are clear and hit pretty hard. All in all, happy for a few hundred dollar investment.