Master Cure and learn/master Dark Lance, then save the rest of your points. Dark Distractor is for PvP only, so don't learn it if you don't PvP. Or if you do PvP, learn it only after you get your more important skills.
Dark Lance is a must for any and every Dark mage. It may not be as strong as Arrow Rush, but it's fast and efficient, and still fairly strong. It'll also be great to be able to cycle through the two skills, so you won't really have to wait for cooldowns.