Delta's top HVCs - graduate class project

I'm currently in a graduate level Marketing program at NYU and for our class project (a 2013 marketing plan), my group went with Delta. I thought it would be fun to put to paper a lot of what I banter about on FT ;-)

One (but not the only) focus of the plan is around building the High Value Customer base through a multi-prong approach that centers around an exclusive program loosely modeled on AA's Concierge Key or UA's Global Services - but invite only and based on revenue and ticket types. (It would not overhaul the existing FF program and would not be a 5th tier status level).

I could go into more detail but for now the reason I'm posting is that I'd appreciate some direction in how to best research that segment - both what Delta currently has at the top tier and what share can be gained from AA/UA. Googling Delta HVCs and related terms mostly pulls up SkyPriority and the Porsche ;-) The 10K doesn't break it out in a useful way for us. We are really interested in the top of the top. Someone that spends mid 5 to 6 figures a year on air travel.

Any thoughts from the industry folks? (or, of course, from anyone else :) )