try and gather all the facts. How much is the house worth at pres on the market, look at any sales, estate agents prices. Then look at how much rental is fetching. Some people don't want to buy a house, a rental is fine for them, if you can get away with charging slightly less than it would cost to buy, but more than servicing a 16K debt, then do it.
I would recon that renegotiating a 16K mortgauge on a house at todays prices would be easy/cheap. Prices are going to rise eventually,so if you can hang on, then go for it. Remember if they reposses, all they want is 16K plus fees, they don't care if you loose the real value of the house. You need to do research, local papers, estate agents, how much could they sell it for now, things are starting to improve on the market, however if its got debt judgements against it, it will be harder to sell. Like credit history, it sticks. If you can keep it clean, free from judgments, its worth it, have you considered a short term rent, some dosh coming in while you get sorted ?.
Best of luck, email me if I can be of any help,
Cheers Ken