simple 2 panel interior door. 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.
Amsterdam by Piet Boon - Bod'or
molding and door casing
grijze binnendeuren - Google zoeken
4 Panel Shaker Smooth Door - is this the door which you currently have -