Kenwoods newest multimedia double din units are a perfect match for the iPhone 4 user. For a small .99 cent per month application you can stream Pandora, Basic Nav, Netflicks, Xm, Sirius making these two units a great deal for a great price.
We have both instock and ready to ship as well.
The difference between the 318 and 418 is the 418 has bluetooth.
Both have the option to add the Kenwood KNA G610 NAV add on for Garmin based NAV as well.
Here is some more info on these new units.
Let us know any questions