I drive a 97 Grand Prix and i want to upgrade the system. i have already replaced the 5 1/4's and the 6X9's with Infinity (refrence?) and i want to change out the HU and add some bass. What would u guys recomend for someone who makes bout a 100$ a week but still loves good sound. For the HU i want it to be compatible w/ my iPod, either a 9mm plug or a usb port in the front. All help is greatly appreciated!