What about another set of C1s - Platinums, with a subwoofer (or 2) if you want to get a bit deeper? You know you'll like the sound and a well blended sub can get you deeper than even C2s if you are looking for bass. I've had good luck blending my REL with Dynaudio's for 2-channel (in fact I had a tough room and using the port plugs in the Dynaudio plus the well placed REL gave me far better bass than previous setups with speakers that went lower), and I've heard great things about JL Audio etc.
If you use it at all for movies/tv you get the benefit of being able to use the .1 LFE used in movies etc.
If you use it at all for movies/tv you get the benefit of being able to use the .1 LFE used in movies etc.