How is that remotely too complicated or too expensive. It's way cheaper than a new radio. You got the iPod/iPhone right? That's 150-300, unless Mommy or Daddy bought it for you.
The PAC setup is by far the easiest way to hook up your iPhone/iPod to your stock system and make it sound decent.
I guess you could always get a FM transmitter but your going to be shoving battery's in that thing all the time or running it off the cig lighter.
Amazon.com: FM Transmitter Car Charger and Mount Compatible with Apple iPod / iPhone: MP3 Players & Accessories