Mu head is spinning. I am a pure novice who just wants a better sounding system as I spend a lot of drive time. I have been told three different things by local dealers.

Dealer A: sub, amp and processor

Dealer B: new speakers all around, amp and sub. No processor

Dealer C: new speakers all around, amp and sub with processor. Said I need processor because without it my voice system, Onstar, rear camera etc. will not work.

Three dealers and three different stories. Again I am a novice who just wants better sound that what I get from the stock system without affecting the voice on star, camera etc. any advice is appreciated. My price range is 600-800. Thanks