HK I think you picked a great speaker and the JC 1s will drive them beautifully. I would not try to hook up one JL sub to them that will ruin your bass definition if you try to do it the usual way. If you want to put subs under the Novas you will need two. If you like JL I would do two 113s. To do it in a way that would improve the overall sound of the system you will have to get into a digital preamp with bass management such as the Trinnov Amethyst or the upcoming DEQX Pre 4. There are a few others but they are below the level of your system.
Franco Serblin was Sonus Faber's chief designer. He broke away and started his own company. His Ketema is the best dynamic speaker I have ever heard. He has since passed on. The man knew what he was doing.