Personally, I'd ditch the Nomad.
Install the Nakamichi if you have a double din size dash opening. It's convenient being able to play CDs and you can use its radio if you don't have a tuner module.

Just pump the Nakamichi into the empeg and set all your EQ/balance/fader settings to 0 so you can use the empeg's eq.

I could see arguments for pumping the empeg into the Nakamichi since it has 3 sets of outputs but that's a personal decision.
I guess the question really is to run 2 or 3 sets of RCAs...