I have a buddy that just redid his subs with Audiobahn. They sound, good, nice and tight. They make some really cool looking subs too.
I have an Eclipse head unit in my car and haven't had a problem with theft. I don't have an alarm system and don't want one, that's one of the reason's I went with the Eclipse. Like Andy said most thieves know their ****. I live in a pretty un-populated area. Any car audio thefts here are most likely by guys that know my head unit is junk to them. Mine is set to a cd that a thief wouldn't figure out in a thousand years.