Though I'm not a big fan of Klipsch, you may want to give their center channel speakers a listen. They're slightly bright but clear....may match OK with your Thiels. For surrounds, my feeling is that you can get away with many different speakers because they are mainly there for special effects. The only downside would be if you do a lot of listening to music in surround mode in which you'd want a closer match. Hope this helps.
