I really liked my old Summits. I really like my new Theos. I also own or have owned and enjoyed a lot of outstanding speakers including the mighty Klipshorn, Belle Klipsch, Dali Helicon 800, ATC SCM 50asl and I have extensively auditioned Maggies (3.6 & 20.1) and many other stunning speaker designs. But none of these speakers can hold a candle to the CLX - although the Klipschorns and the MG20.1 are excellent speakers in their own right. The CLXs are one of the best loudspeakers in the world because they don't sound like loudspeakers. Sure, you can buy speakers that go louder, or deeper, but I just cannot imagine any box speaker coming close to what the CLX can do...
P.S. marck, you don't really need a sub. The CLX will deliver 99% of the music to your ears without the coloration (sorry Summit owners!) in the bass that the Summit delivers. If you feel the need to 'feel' the bass, you could consider adding a REL or ML at a later stage.