I am right there with you but when i was doing Car audio i took it way to far. I had an Alpine headunit MB Quart mid ranges PSD 216s in the rear and the DSD 213s in the front power by a JL e4300 4x75 @ 4ohms. so for me I never used the built in "AMP" on the head unit but Kenwood does have a nice one for the money. and of course did the whole crazy subwoofer thing too.
But that JVC install looks nice. Hows it working out for you?