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keep in mind that the tax credit is for $8000 or 10% of the purchase price whichever is less. So with a 30-35k home you would be looking at a $3-3.5k credit. Only you can decide when is right to purchase. If a layoff is eminent you may wish to wait, but without knowing you financial situation it is hard to offer you any advice worth anything.
My gut feeling is that house prices are not going up anytime soon.
Good luck.