To rebuild your wealth, do two things, live below your means, and do not assume debt. Trying to buy this house is to assume debt. Forget the house, take the foreclosure or someone buying your house via short sale. If you have a job, you are a step in the right direction. Rent and quietly save. Use the savings to eliminate any other debts you have. The other reason you want to rent during the time you are trying to rebuild your savings and credit is MOBILITY. If a better job is available in another part of the country, you can pick up and go when renting.
I'm looking at this from the aspect that if I can get this house, it will be paid off with a years time and I'll be in the house that is mine, free and clear. No payments, just the insurance and upkeep.