For modern metal music, I prefer cardioid pattern SDC's as a spaced pair. I love KM184's, but every now and then (and if available) a pair of 414's work wonders, too!
If you have a nice room and are doing pop/rock stuff then spaced omni's can be really nice. Generally for metal though you'd want something more dry so cardioid is your best bet.
Figure 8's are too narrow on the front side for my taste as an overhead unless you go quite high. It's sort of like using a shotgun. I definitely prefer cardioids for overs but anything is fair game for room mics.