Well done on the credit score, but that alone is not going to do it. Banks want to see you take some of the risk, as much as possible actually, then there is less risk for them. Your situation represents an unacceptable risk for them, because in if house values continue to decline in the short term, the bank's investment in the house is not going to be protected, so there's no way they are going to agree to it. This is why it has all gone wrong - people ended up owing more on the house than it is worth. Hope this helps.
What you might want to do is look for somewhere that is available for rent with an option to buy. This would then give you the enjoyment of the place you want to buy, plus time to save the money. You would not be committed to buy, but you would have the right to do so at a price agreed now, and at any time over the next X months/ years, whatever is agreed between you and seller. The seller may even be willing to help you finance the purchase, but finding a seller willing to do that on the one property you want to buy, may be tough.
The time to try and buy without money is when house prices are appreciating rapidly, not the reverse. You need cash in this market, otherwise my advice is don't even attempt it - stay away until you do.