We've got a comprehensive thread about the iDataLink Maestro setup on these forums, just do a quick search for iDataLink. If you're used to just swapping the head unit like in other vehicles, unfortunately you're out of luck with the Mustang. The climate controls run through the stock head unit, so you've got to get a whole dash kit along with the new deck. The Scoshe is one option; I and many others have the iDataLink setup and we all seem to love it. You can get a full nav system (even though you say you don't want it) from Kenwood along with the dash kit and all the necessary installation equipment for around $500-$600 depending on the deck you choose. Price goes up from there.
2014 GT / Black / 6-speed manual
Airaid CAI / Roush Exhaust / Bama Tune /
Custom Vinyl / Shelby Spoiler