Galco KingTuk. I got it with the gun when I bought it; it works pretty well. Not sure how the leather will hold up when it gets real hot down here though. It tucks pretty well, but I've found that when untucked my shirt tends to ride up a bit and get caught between my side and the sweat shied or the sweat shield and the gun.
I carry daily IWB in a N82 and it is almost un-noticeable. I use the deluxe. I also carry in my pocket with a Sticky holster. The Sticky's are good for IWB also. I am an instructor and like to test things a lot before I recommend them to my students and I have hundreds of hours in many many different holsters. However not all holsters fit everybody the same. Best thing is to try them if you can.
By the way I think that Shield is about the most versatile CCW pistol going. I know that is up for plenty debate, but I love them.
Check out this place if you are still looking for an IWB. Leather with Neoprene backing and they have a kydex front and have an extensive collection of molds for different pistols. They are just coming on the Market and made a great showing at SHOT Show 2014. If they dont have what youre looking for I would be shocked!