Best way to get music from iPod to vehicle speakers

So I noticed today that the CD player in my truck decided to start clicking when I play a CD so I figure that it's about to go out soon. I was wondering if anyone had any idea on the best way to integrate my iPod into the speaker setup. Everything is stock and it's a GMC Sierra so it 's a pretty common truck. Price is not a problem as long as it's nto completely ridiculous.