DeviantGatestone.
It's free, 50K Xp/Hr and not bannable (well, extremely low banrate).
http://scripts.rsbuddy.com/?script=Deviant+Gatestones
Haven't done much research on other methods though. I just know most other people are using this at the moment.
You need 4 Dungeoneering and 27 Runecrafting along with 32 Magic.