iPod 4G iPod nano compatible car stereos?

Since I'm about to buy a car stereo that can directly control an iPod, I've read that many of these car stereos cannot control the 4G iPod nano.

Does anyone here know how to find a list of car stereo head units that are 4G iPod nano compatible? Or offer an adapter cable so the head unit will work with the 4G iPod nano?

An update: I may just forget the idea of getting a head unit that can directly control the 4G iPod nano.

I may just get myself a lower cost car stereo head unit that has the 3.5 mm stereo phone jack auxiliary input and get myself a Griffin Technology AutoPilot adapter instead. Since AutoPilot is certified by Griffin to work with the 4G iPod nano or the 120 GB iPod classic, at least I can get line-level audio output from the iPod to the car stereo, which should have reasonable sound quality.

I just ordered a Sony CDX-GT730UI to be installed in my car. I found out that this car stereo head unit works with the 4G nano, provided I use the USB 2.0 cable provided by Apple with the player.

The only bummer: every car stereo store in my area is so busy I won't get it installed until this weekend.