The WSJ recently ran an article that had more specifics about the home buyers tax credit, which can be used on homes up to $800,000 and has a maximum income limit of $245,000. The credit does have to be used for the purchase of your principal residence, but you no longer have to be a first time home buyer!
I recently sold this move-up house in South Eugene for 342K, on short-sale, down from the original listing price of 539K. There are plenty of good deals to use the tax credit on.