Good News! I received the Westell 7500 router. Everything works great! If any of you have a Centurylink 660 series router, call them and tell them that you want the Westell. I had to pay a $15 shipping charge to get it, but it was well worth it. As soon as I entered the passkey, it was an instant connection and everything functions as it should.
Many thanks to all of you who gave me advice and helped me through this process. I now love my ZTE!