I want an awesome sound system in my car but I have no idea what to buy and where to buy it. I think I need new speakers too.

What brands should I be looking at? Can I just go to somewhere like Best Buy or are there better places to go for this?

I don't really need bluetooth or GPS or anything, I just want the sound system. I guess a lot of the new receivers include that stuff anyway though?

How much should I expect to spend? I want to spend ~$400 (including installation) but if I had to spend more to get something really good, I would.

Someone help me!