Any good dash kits and dvd.nav units to go in the cobalt, you guys would recommend?

 

Avic N1

 

Pioneer AVIC-N2 or the AVIC-D1. I just bought an AVIC-N2 with all the goodies (Voice navigation pack, XM NavTraffic tuner, and the backup camera. The D1 is a double-DIN unit but I'm not sure if you can fit it in the Cobalt. Look around for a good buy. You can easily find either unit brand new on ebay for $1350 instead of the $2000 retail.