Be very careful. Not all Ipods work with all HU's.
Found that out the hard way. I've got a Pioneer N4. Lit says Ipod compatible. That's all. I've had it in my truck for over a year with a 12 CD changer and 3 extra magazines. So I'd have 48 CD's loaded and ready to go all the time. Last Oct. I decided that wasn't enough. So I went and got a new 120 gig Ipod classic. Only to find the classic doesn't work with the N4. It works with the new N5. So I had to go on Ebay and find a 2 year old use 60 gig Ipod. So I now use that one only in the truck. The classic goes with me to the gym.
Good news is, I now have about 2600 songs, 175 CD's, at my fingertips. With room for about 300 more CD's.
I can't remember the last time I listened to my radio. Not even sure if I set any of the pre-sets on the darn thing.