If you are serious about buying, I would go ahead and contact several lenders, find one you like (ask for a sample Good Faith Estimate in addition to current rates), get approved, and start looking for a house. The mortgage market has been so volatile in the last month or two that once you see a rate you like you are going to need to be ready to act almost immediately.
Once you've decided on a lender, the originator should be able to keep you updated when rates change.
