Are there any recommendations on ammo?
Whatever you can find. It shouldn't have any problem with any of it.
The XD Service is a big and heavy enough gun that I hope we don't hear any whining from you about how "snappy" the .40 is.
"As was the man of dust, so also are those who are of the dust, and as is the man of heaven, so also are those who are of heaven. Just as we have borne the image of the man of dust, we shall also bear the image of the man of heaven. "