I do not have a brand recommendation. But I do agree with you, if you can convince him, the stock is better that an aftermarket.
I have not changed the air intake on mine, and do not plan to. I have read about too may turbos and engines being dusted by a CAI. For me, it is not worth it. With the factory setup you are good to over 400hp with it, and the filters last forever. With the Donaldson Powercore Filter they come with standard, the are not considered full of dirt until they have captured over 3lbs of contaminates. I have not changed the air filter on mine since I bought it, and I have put over 40,000 miles on it. I have taken it out and checked it, and it still looks good. But my truck stays on the road, and it is not all that dusty where I live.