The ZyXEL AC1750 will be shipping next week. Any chance you will be taking a look at it? It will also support Qualcomm's Streamboost like the disappointing D-link DGL-5500 does. Before the FCC site went down due to the government shutdown, I believe I saw it had the QCA9558, QCA9880 & 256MB RAM.
http://www.newegg.com/Product/Product.aspx?Item=N82E16833181305&Tpk=ZyXEL%20NBG6716
http://www.newegg.com/Product/Product.aspx?Item=N82E16833181305&Tpk=ZyXEL%20NBG6716