I have an 03 with a RF head unit and I have not been able to find an option for ipod other than an FM modulator. The best option is to go buy an ipod ready head unit, some of them actually include cables that provide power and controls at the deck. And honestly, they are not that expensive. Head unit prices have dropped dramtically in the last few years. Yes, you can still spend alot of money on one but there really is no need. Here is a link to one that works out of the box:

http://www.crutchfield.com/S-kjIlGdurfzi/cgi-bin/ProdView.asp?g=300&I=105KDPDR30

Hope this helps. Oh, if you have never installed a head unit, do not pay to have it installed. There are plenty of resources and instructions online to do it yourself if you have even an ounce of mechnical ability. All you need is a mounting kit and wiring harnes. Both can be found at Wal-Mart, Circuit City, Best Buy, etc.