with a modern styled home I think either a 2 panel door or a flush door looks best, though in a pinch there are some great 5 - 6 panel doors that could work as well. but for me it's always best to keep it simple.
Love the door color. door paint color: wrought iron by benjamin moore trim paint color: westhighland white by sherwin williams. Would love this gray color for the front entry door.everything looks good on a charcoal gray door!