My factory speakers sound awful. I have a new Pioneer DEH-3100 with no amp. I just want some speakers that will sound good with the unit. For about $130 - $200 + install I can get lower end Infiniti reference or Polk (db5251) component system. Stereo shop says to stay away from Infiniti and component systems and recommened set of Rockford Fosgate speakers installed for about $300. I am lost and confused. Is ther any advice on Infiniti vs Polk vs Rockford and component systems. I just need 4 speakers that will match the unit I have and sound good. Thank you.