I would like to replace the factory fitted head unit in my Honda accord with
an MP3 unit.

I have actually done this already with a Kenwood unit but I have
a) lost use of steering wheel audio control
b) lost sound from my Nav-Sat system

Could a new non-Honda unit rectify this?
Is there now a standard connector for allowing connection of these fairly
common interfaces?
Any head unit recommendations?

Regards,

Steve