Thiel CS2.4 to what?


I'm getting the itch to upgrade my speakers (Thiel CS2.4). Nothing really wrong with them, they image like crazy, is like a clear window into the music, but I sometimes feel they are a bit too "reserved" and missing the joie de vivre. Looking for something that instills more life.

Rest of the system is PS Audio DirectStream Dac driving a pair of Bel Canto Ref500M. Front end includes a PS Audio PerfectStream Transport, a Auralic Aries streamer, Clearaudio turntable with PS Audio NuWave phono. All cables are Cardas.

My room is a semi-dedicated room (sharing it with my office, which is in an alcove off the listening room). I do have a sloped ceiling on the front wall (it's a finished attic), about 16' wide and 14' deep. Some acoustic panels to tame reflections.

Budget would be in the range of $4-6000 above what I can get for the Thiels (thinking about $2k as they are in awesome condition and has the upgraded maple finish). Basically, what would you recommend that is similar to the Thiel, but has more dynamics and a bit less sterile.
audiojan
I think JL Audio, while good, is expensive for what you get.  If possible, two small subs are better than one large for your use, as it will help to minimize room modes.  There is a great deal of information available about the benefit of multiple subs, as well optimizing setup.  

Depending on your ability to place subwoofers, the Audio Kenesis Swarm may be a good option and in your price range.  

http://www.audiokinesis.com/the-swarm-subwoofer-system-1.html
"Sunfire would be a close second to REL. Happy Listening!"

I love Bob Carver and use a Sunfire amp, but their subs are far from great.  If you have no room for anything larger, they can serve a purpose, otherwise they are best avoided.  High distortion, poor response curve (QTC), and poor group delay.  Thiel Small parameters didn't change for Sunfire, they just shrunk the box and the efficiency and then used power to try and compensate.  
From what I've read I think the Audio Physics are somewhat similar with a great soundstage and some models should be available around $6000-$7000, cheaper if you go pre-used. I also like Focal but Focal Sopra are more expensive. I don't remember what the Marten Design speakers cost but they are also worth investigating.

http://www.audiophysic.de/index_e.html
http://www.ear-usa.com/marten-loudspeakers/