I have a 04 Accord with a really bad sound system. I want to install 4 (5 1/4) speakers around 70 or 80 RMS and a 4 channels AMP 75/80x4. I don't want to make any modification so I gess I'll keep the HU.Can someone help me put this packege together, I was thinking on using Polk speakers. My budget is around $600 or $700.