If you had $500 to spend, suggest speakers/sub for better sound
 

Looking for suggestions.

2008 s-line, I want to keep the Audi symphony head unit and I already have two alpine amps from my last car (one for speakers and one for a sub).

I have a budget of about $500 to spend on speakers and or sub.

With that money what would you get to upgrade the sound from the stock speakers?

Definitely get kenwood products! There not super expensive but still good quality I have everything kenwood and it sounds great! Not sure how much bass you want but one kenwood 12" KFCXW122D sounds really nice with an amp that can push it!