Actually, what you care about people say about Sony no good and that. More importantly is whether you are satisfy with the current sound quality produced by your current set up. Not forgetting is that a good set up is a combination of all equipments including the amplifier, speakers, cables and most importantly tuning and installations skills. Honestly, you should try optimizing and maximizing your current set up before start changing this and that. Try not to be influenced by forum dynamics as some tend to over-promote certain brands. One final piece of word, it is your car at the end of the day and bear in mind that everybody has different taste in music just as you taste your food (although the deviation from the norm is not that big)