Tweekerman, to answer your question, I would take the Eros Mk-II over the CLS IIz and the REL Storm combo (to me that's not even a close call). As transparent as the CLS IIz may be, the Eros is equally adept. And I have never heard the CLS throw the kind of huge, open soundfield that the Eros can easily manage. Nor can it match The Eros' dynamic capability or maximum output level. Plus if you get the Eros II, you may find that you don't even need a subwoofer. And you can always add a great subwoofer down the road if you think you are missing much. Actually, Roger Sanders does not recommend a subwoofer for use with the Eros unless it is a very high quality sub crossed very low. With the CLS you will almost certainly need the woofer right off the bat.
BTW, for those who are curious, Roger Sanders is not resting on his laurels. He is working on an even larger electrostatic system, the Ethos, although that system may not be a reality in the near term. He has also told me of some tube amplifiers he is developing, including a direct-drive OTL model to drive his ESL panels, which may be introduced sometime later this year.
InnerSound appears to be a proactive company, that is not about to become complacent in the light of the good press it has received thus far. I think this kind of progressive approach is key to continuing success in the long term.