You'd probably like the Evil Zone soundtrack.
http://www.youtube.com/watch?v=MQHYZy5aXw4
http://www.youtube.com/watch?v=QAw36arOfeE
http://www.youtube.com/watch?v=LC6rbGSFk9c
I also must recommend the OST of one of my favorite obscure anime, genesis survivor gaiarth:
http://www.youtube.com/watch?v=XJLviAsnsIk
here's the ost for the above if you like it.
http://www.megaupload.com/?d=Z5DC5UBC
The password is "shitfuck"
I'll be watching this topic for more synthrock.
Finally (I've been editing this a lot, damn), the Android Assault/Bari-Arm soundtrack:
http://www.megaupload.com/?d=GANWLR16
Obscure as hell, amazing soundtrack. Password is luelinks if there is one (and I'm not leaking content 'cause I ripped and uploaded this).