2007 Focus ST3 - USB/Ipod Connectivity?

[[SKR]Phoenix]

Picking up the ST at the weekend (can't wait!!!).

It's got the Sony Headunit and 6 disc changer, but I don't know the model numbers, so I am having trouble finding out which ipod/USB kits will work with it.

So if anyone knows or has experience on this, please can you let me know which kits work and how well they work.

Thanks for any advice.