After a couple of failed attempts (amateur auto electrician fail) I'm going to install this one soon:
CCD SONY Car Rear Reverse Camera For SUBARU FORESTER / OUTBACK / IMPREZA SEDAN
http://bit.ly/UmA0KN Surprised by the good finish on the delivered unit!
I went for no on-screen guidelines.
The housing is a bit smaller than stock (wagon), there's a DIY on nasioc (from memory) where the installer made a mount from hdpe cutting board so the camera sat flush with the hole and the gaps were filled.
I've already run the video cables to the back of the nav screen in preparation.
This time I'm armed with a test light, multimeter, wire taps and will rtfm carefully before proceeding.
Fingers xxx'd!