I am partial to Owen Cyclery. I bought my first new bike there in 1994. At the time, old Mr. Owen was still alive. His son took over; now I think another guy is running the place. I forget his name, but he was about to marry when I ran across him on a ride in Knoxville in 2003. He is a really nice guy, and presumably that would translate into a good person to do business with.
Google and you will find the address. It is on the main drag in Hixson.