+1 on the domain names. Also can you provide some kind of independent valualation as to how you came to the conclusion as to their worth
Sedo.com, BuyDomains.com, etc. Up to 100k in price each, really. Email me for the names.
I would rather not agree to a condition keeping the names of the domains secret. I don't see any potential harm to the value of the domain by making the fact it is being held as collateral public. Also making suck fact public allows the community to peer review any potential deal.