I may be a bit behind the times, but there appears to me to be a new and more generous player in the miles for mortgages game.
I saw an offer for Alaska Airlines miles this morning: 1300 miles (rather than 1000) for each $10000 in financing and 3000 miles per 10000 for buying/selling plus miles for moving, miles for using more than one service, and bonus miles for AS elites.
Then I modified the URL to find the same offer with Delta, United, and Continental.