Do a search for audio upgrade there are several threads on options. Check my thread on audison with hertz speakers if you want the best solution using the stock radio and controls.

I have i pair of jp speakers that are a good option if you don't want to spend money And time on installing an amp. I'll sell them cheap if you want. Mvp4 amp from nvx (brand is off my memory) is a $100 range amp that is small and powerful.

I'm be at the rally if you want to check out my upgrade.

Best of luck!
Cocokola