Since you still have your factory radio, you can add an iPod or XM radio to it using the AUX feature. I just added an XM Commander this way. What you need to buy:
1 CD Changer Harness
1 PIE GM10-AUX adaptor
1 RCA Cable to iPod adaptor
I bought my CD Changer harness and AUX adaptor from Litewarehouse. Tuan Le at Litewarehouse is great. Install is EASY!! At the passenger floorboard is where you plug in the CD Changer harness. I then layed the additional harness back and forth under the carpet at the door sill. Then, you plug in the AUX Adaptor into the harness, then your RCA Adaptor for your iPod into the AUX Adaptor. Now you are set with tunes!!

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2001 Chevrolet Corvette Z06
Quicksilver/Black

Mods: Halltech Stinger-R Intake, Predator Programmer, XM Satellite Radio, Flameball, Blue LEDs Aluminum Gauge Bezels, ACC Rear Exhaust filler
Mods Coming: Chrome/Painted covers for motor and more...