Hello, New to the forum. I am looking to upgrade my stock stereo system. I have a quote for a sony mex-m100bt head unit, hertz cx165 speakers, and a sony xm-s400d amplifier installed for $1231.36. Is this a good system? I am pretty ignorant on audio systems. I want to me and the wife to be able to hear the radio with good sound at 75 mph. Any and all help would be appreciated.