You only need to worry about having the higher output rca's if you plan on running them to the amplifier instead of the speaker outputs. If you never plan on upgrading anything but the deck then get one you like and just have it installed the way a normal replacement radio would be installed omitting any RCA connection or adapter. The normal radio adapter you buy to install an aftermarket stereo will be sufficient. Just keep in mind that there will only be wiring for 2 speakers on the car side of the plug.