I don't know anything about the specific IEMs you mention, but if you plan using it exclusively with IEMs, I would assume the IEM card would be your best bet. It should have enough power to drive most if not all IEMs. Note that I have only heard the 901 with Balanced amp card myself.
Hi again Lars,and thank you for your response.
You use the Balanced amp card,with single ended,or balanced headphones ,because I don't like to carry huge wires on the go,so I like single ended solutions.