Same here...but that will soon change.
However, I plan to leave the stock head unit...Aftermarket heads are the first thing thieves look for and its in plain sight at all times. Flip faces don't fool anyone....cause everyone knows that new cars come with stereos, the flip face would only work if you had a single din stock head, and a flip face aftermarket installed right under it. Then the thief would think the flip face was a cd holder. . .and 90% of people keep their detatchable face in their glovebox or under their seat so that doesn't stop all thieves either.
What will stop thieves (well smarter ones that would be more successfull and know their equipment) is the Eclipse ESN and cd-key. It is essentially low-jack for your head-unit. First, once the head looses power, it requires you to insert a specific cd (you choose this the first time you use it) before it will work. Second, it has a homing device inside so if it is stolen, or your car is stolen, it can be activated and recovered. The Eclipse ESN (eclipse security network) has been around for a while, and your head unit blinks like an alarm LED so it will stop all but the dumbest thieves. For them, Eclipse provides a little window sticker, if they know how to read.