How about some clarification from an IRS licensed Enrolled Agent? I deal with this all the time, and here are my instructions to my clients:
1. List all your assets at the time of the COD. The valuation is "quick sale value", or what you would get by putting them on your lawn with a "For Sale" sign on them
2. List all your debts, including the one that was discharged.
3. Subtract the two and compare the difference to the COD. If the difference is larger than the COD then you can use Section 108b to exclude from income the COD to the extent it is less than or equals the difference between assets and liabilities.
There is no set way of valuing your assets - so I use Quick Sale value. That is the method used in an IRS Offer in Compromise, and since COD is similar to an Offer in Compromise a similar valuation method is appropriate.