Miz,
If the seller has a lot of equity, and really wants to sell, you might find him to be very flexible. He might be willing to hold a big 2nd mortgage, which to a 1st mortgage holder is the same a a big down payment. With a big enough "down" you'd be able to get financing. You can do the note on the 2nd such that you will have time to repair your credit before having to pay it off. There's a ton of different ways you can go if he's flexible. There's probably some good brokers here on the board to give some advice. I think I'll start a topic...
Rocket