Depending on what your long-term plans are, you may want to take a look at the JL Audio Clean Sweep.
This will take the speaker outs comming from the factory radio, do some magic technical stuff that I dont understand, then send the sound out to your speakers. The Clean Sweep is a must
if you plan on adding aftermarket speakers. The Clean Sweep also adds a set of audio inputs, which you can use to add an aftermarket dvd/nav unit, multi-disc cd changer, ipod, or whatever. The only places authorized to sell JL Audio products are the higer-end audio stores like Ovation. The Clean Sweep will set you back about $300 or $400 bucks (I dont really remember for sure), and is ideal if you want to retain the factory look or any
of the functions in the DIC (remember, this includes all the buttons on the wheel, the personalization settings, and even your trip odometer). I dont know of anyone who actually has one, but I plan on getting one when I get the $2K or so that I need to put in a whole JL system (speakers, subs, and amps). If you want somebody else to take the plunge before you do, feel free to "loan" me the money and I'll tell you how I like my new system.