Get yourself a newer Alpine aftermarket CD head unit with the Ipod "Full Speed " connection.

You can simply plug your ipod into the deck with the accessory cable and pump it digitally into your stereo, as well as control the ipod with the head unit.
It will also charge the ipod.
Don't bother with any FM modulators. They suck.

The Alpine units are also bluetooth capable so you can also pipe your cell phone through the head unit as well.

I think my head unit was the 9856 by Alpine.
300 plus the cable.