What are you looking for in a headunit? You want bluetooth, navigation, ipod control, auxiliary, cds, Pandora (whatever that is), are you picky about button colour, etc.
For me personally, I have a pioneer avh4400. I got it for two reasons. First being that it had ipod control. I wanted something that i could plug in the ipod and forget it. Control it all on the touch screen.
Second reason is the button colour. I'm slightly ocd, so I had to have matching button colour to the rest of my dash. (even my air Spencer air freshner is green rather than the blue everyone has) with this unit you can fine tune the button colour to your liking.
I love it. Very fast connection time, looks great, and I've never had a problem with it in the cold winter months. Ipod frozen but the headunit never fails me.