Yup, the CB2 is a nice sonic improvement over the CB1 even when I just had the Superior DACs. Come over to the Audio Video Imrpovements forum, and do a search for "Casablanca" or "Theta" and you'll find lotsa stuff and info. www.avsforum.com
Check out avsforum.com They are into A/V big time. Steve Bruzonsky has a Casablanca, but I believe he's already upgraded to the "extreme" dacs. He should still be able to answer your Casablanca questions, he's had one for quite some time.
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