I bought one used from cash converters for 70 dollars aud, and its practical, but moderately customisable. It has features for your amp, and even subwoofer. My subwoofer is looped through the rear speaker channel, and has excellent bass. Aux in on front, rca on back, dimming, the works. Only gripe is the lcd shows all options, no matter how you look at it.
cheap, effective, bass, aux, rca, remote control.
no steering wheel control input, lcd shows all functions in any viewing angle