And here I thought you were coming back to tell us you found a way to MS your way to a free house
I think most of the info you are looking for is buried in the AoR threads so you might be better off searching the myfico forums. That said, you need to focus on getting your score up as high as possible (at least 760) for the best mortgage rate. 0.5% can mean a five figure difference in interest over the life of the loan which no signup bonus is worth that imho. An AoR now will only bring down your AAoA and make it harder for your score to rebound by the time you find the perfect house.
The rules of the game and the players may change, but credit card offers will always be around.