If you have bad credit and have been foreclosed on, you don't NEED to buy. You need - in my opinion - to rehabilitate your credit before buying anything on credit again. At which time, you can buy from a position of strength, by having buying power.
All the best,
As a rule, L/O is not a good way to go; You are the mercy of the Seller who can dictate the terms, it is full of pitfalls, it is way more expensive than using a Lender, and the Seller does not report to the Credit Agencies, thereby improving your Credit Score.
I will state that Lease/Option is the ultimate "Caviat Emptor"!
4 years should be enough time; you should be able to get a loan.
I can recommend a Mortgage Specialist who works in all 50 states; he's honest and knowledgable.
Shane Milne, and you can e-mail him at email@example.com
He is regiatered on Trulia; you can look up his PROFILE and RECOMMENDATIONS.
Look for the VIEW A TRULIA VIP and chick it.
Good luck and may God bless