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Sierra Pacific is the only one I am aware of still doing 95% on conforming in declining markets, they require a 680 score and no more than a 41% DTI. Out of curiousity though, why not use FHA?
There are various ways to determine if a market is declining or not, the big one is the Case-Shiller Index. Some good links on information that index is based on, amongst other items, at the Wikipedia hyperlink. The other popular method would be reviewing the appraisal, if the appraiser says values are declining then even if the Case-Shiller Index doesn't say it's declining, a lender/PMI company would still consider it declining.