Getting into range? Burning Speed, Ride the Lightning or Magnetic Grasp both get you close to your foe. They either have 12 or 15 sec recharge which is OK.
Getting out of range? There is always Lightning Flash (utility), which teleports you anywhere you ground target, but you can use your spells to chill and cripple your enemies too, making it difficult for them to follow you (Frozen Burst, Armor of Frost, Churning Earth, Earthquake, Updraft) If you equip the Signets of Air & Water (utility) you have an additional chill (active Water) and a 10% speed boost from the passive air signet. Should (unknown to me) the trait Windborn Dagger stack with the signet's passive effect, your permanent speed boost will be 25% (trait adds 15% speed boost), which should allow you to kite almost everything.