Up your budget slightly, look at the Alpine IDA-X series of head units.
Can't stress how good they are. They start at about £120 if you shop around, up to several hundred. What they do though is fully and properly integrate with your iPod to be able to control it properly, with a jog wheel, a la the iPod itself. And they've got a proper display rather than a one line LCD thing so actually displays a lot more of the track info at the same time. I've got the 2008 IDA-X100 (was the top model at the time) in my car, it's ace!
Oh, doesn't have a CD player built in, but once you've got all your music on your iPod anyway, that doesn't matter…