Check out the PXi50.2 and the PXiBT50.2 at the link below.
They are amplified controllers without the need for a head unit. You can add amps, etc too.
The PXiBT50.2 has bluetooth or cable connections or the PXi50.2 uses cables.
http://www.kicker.com/content/Power_Sports
I plan on getting one for the 76 and leaving the factory radio in place.