Here I was waiting for Tim to answer that one...but anyway:
High ISO: I used 1600, Tim probably used 3200. I used an f/1.4 lens, Tim used his f/1.8?
Shutter speed as slow as you can without getting motion blur...I used 1/30 sec. If I used 3200 I would have gone to 1/60 or 1/45 and gotten a better result. But I just don't like 3200 on the XXD series. XD is another matter.