Most of this subreddit are folks who live in The States. We don't have the Kalos over here, but it looks exactly like our Chevy Aveo. This is the harness that you'd use for that. If you're coming from factory, you'll need this dash kit too. Yes, that's a decent radio. Keep in mind it does not have a CD player....not sure if you care.
iSimple Tranzit Blu. They also make the Tranzit Blu HF that will allow phone calls. That will require a microphone and button to be run and accessible to the user. The regular Tranzit Blu just has an on/off switch showing I believe.
You can also pick up one of these and do away with the aux cable. :)