Runeshark (with a little bit of BornforPvm) are great to watch in general while skilling and doing tedious tasks.
Boaty (Itsadamlynedawg or MynameisB0aty) Best video making out there to this current point in time.
Silentc0re just because he makes good content.
I here this iBeJooked kid is pretty good! Check him out! http://www.youtube.com/user/iBeJooked
But RuneShark, Soft Pillow, and MissPinkAsian are all good.