I use the teknetics gamma and love it! Took some getting used too though (still learning it), as it seems to be very sensitive. I can't comment on the clay in NC, as I have not hunted there. The soil here seems to be for the most part pretty mild. That said, conditions can and do change. I have went from hard packed dirt, to gravel, to sand, to moist loamy dirt, all in the same hunt. The ground balance is a plus for sure. And ground balancing the gamma is really easy using the "ground grab" feature. Manual ground balancing is also an option. Oh, by the way, we do have clay here as well. It may not be the same type or as concentrated though. Terrain and ground composition here can vary quite a bit in a hurry IMO. I have the stock 8" concentric, 5" & 11" DD coils for my gamma and they all seem to work really well here. I use the 5" for tight or trashy areas, the 8" for general purpose, and the 11" for larger areas like big parks, soccer and ball fields ect. If it were me, I would purchase with the stock coil and use the other towards a pinpointer. Less time recovering a target = more time to find another one! Hunted for a year without a pinpointer......Very frustrating at times, I didn't know what I was missing until I got one, now I can't imagine hunting without one! Whatever you do, good luck and happy hunting!