There's nothing wrong with Circuit City or the equipment they carry. I used to work in the install bay at one, and have used all the equipment that you have in your car. (When I saw what you had, I knew you went to CC, but wasn't going to call you out on it //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif)
But all of the equipment you have can sound full and warm; it all just depends on the install and settings. In fact, the Polks are some of the warmest sounding speakers CC carries. Just do what everyone has recommended, and adjust your amplifier correctly, and you ought to hear some serious differences. Perhaps tomorrow, just go out and tinker with it to see what you like most.
So tell us more about what you are dissatisfied with... have you tried turning off the subwoofer and listening to the speakers alone? Do they have any bass to speak of? Do they just sound shallow? Are the tweets overly harsh and in-your-face? Does the bass lack punch?
All these symptoms can be remedied with some minor tweaks in the install, and in the settings on the head unit and amplifiers.