[jmil1974]

Ok, here's what you do with your $250.
Go get your SOny 6x9s replaced under warranty.
Get an old alpine or fosgate amp off ebay, you can find LOTS of decent amps (4X50) for less than $100.
Get a Polk EX 10" sub, off ebay, less than $50 with box.
Kenwood 4042 EQ $50

Spend the other $50 on building a new box or a set of used Boston Acoustic, Polk Audio, or Infinity 6X9s if you can't get the Sonys replaced under waranty.

The amp is KEY. You head unit is only giving 12-15 watts of power. It simply cannot give more than that from that space, period. You NEED the power to get more volume without distorting and blowing your speakers. There's no way around it.

I have Boston 3 way 6x9s, an old alpine 35X2 amp (3522) and an alpine HU and it's plenty loud under most conditions and no distortion. The old Alpine amps work great for what you want.