Well I have owned both. For me it is no question, the CDM-NT series was/is superior in all areas except for bass extension. I havent heard the new 700 series but they are based on the same drivers. So I suspect they are very similar.
Dont get me wrong the Studio's are great. However, the extra 30% to 50% cost for the B & W is well worth it. IMO. I would give both a listen, at home in your system if you can, or side by side at the least. Let us know what you think, I am curious what the new 700s sound like myself.
McCormack make great amps, BTW.